Divisor is equal to 0

Hi
Im having a problem doing a division calculation, i get the error divisor is equal to 0.
select
project,
week_beginning          week_no,
actual_quantity,
planned_quantity,
round ( sum (actual_quantity) over (partition by week_beginning order by week_beginning asc rows unbounded preceding) /
       sum (planned_quantity)   over (partition by week_beginning order by week_beginning asc rows unbounded preceding) ,2)     cum_actual_quantity,
sum(planned_quantity) over (partition by week_beginning order by week_beginning asc rows unbounded preceding)      cum_planned_quantity Marco

That means your denominator is equal to zero.
for a simple example try
selct 2/0 from dual will give you the same error.
One workaround is use the decode.
Ex: select decode(denom,0,0,x/denom) from tab_name

Similar Messages

ORA-01476: divisor is equal to zero Error in tabular form

Hello,
My tabular form will give me this error sometimes: Error in add row internal routine: ORA-01476: divisor is equal to zero. I don't understand what causes it. On the form I have a on load - before header process that will add 5 blank rows automatically, which was wizard generated. This error doesn't always happen, when I turn off this process and then turn it back on it works fine. Currently I have to set the condition to never, so I don't get the error. Is this a bug with Apex?
Also, when there is data available I have to click on the next arrow for the data to display.
Please advise.
Thanks,
Mary
Edited by: MaryM on Feb 26, 2010 9:49 AM
Edited by: MaryM on Mar 2, 2010 11:16 AM

Hello,
I have the same error message for ADD ROWS in tabular form. It is also happens when I try to open one empty record using On Load when page rendered. Have you found a fix for that ?
Thanks,
Marina

BI Report Error:ORA-01476: divisor is equal to zero

I have written the Query containing the Pl/SQL procedures and is working fine when executed ,but when I am using the same query for the BI Publisher report , in the Runtime the report is giving error *"ORA-01476: divisor is equal to zero"* .
Please provide me with the answers and help ,as it is most important for me to get it solved.

Hi,
Try this...
case when nvl(Y,0) = 0 then 0 else (X/Y) end
Replace your columns in place of X and Y in your query..
hope helps you....
Cheers,
Aravind

Divisor is equal to zero in date function

Hi
I have used a query like this but am getting error like divisor is equal to zero
with s_mon as (select to_char(add_months(trunc(sysdate,'rr'),level-1),'Mon-RR') month from dual connect by level <=12)
select s_mon.month,
tgdate
from abc ,s_mon
where to_char(tgdate(+),'Mon-RR')=s_mon.month
Result should be like this
month tgtdate
jan-12 01-01-12
feb-12 05-02-12
mar-12
apr-12
dec-12
Edited by: vishnu prakash on 27-May-2012 00:32

Vishnu,
I did not get any error for the below statements; Does this not match with yours? If not, then please post your table structure, data and the exact query in which you are facing error.
drop table test_table;
create table test_table (pk_col number, col date);
insert into Test_table values (3, to_date('MAY-2012', 'MON-RR'));
insert into Test_table values (4, to_date('DEC-2012', 'MON-RR'));
select * from test_table;
with t as
select to_char(add_months(trunc(sysdate, 'rr'), level - 1), 'MON-RR') month
    from dual
connect by level <= 12
select b.month, a.col
from test_table a,
       t b
where to_char(a.col(+), 'MON-RR') = b.month
MONTH     COL
APR-12
AUG-12
DEC-12     01-DEC-12
FEB-12
JAN-12
JUL-12
JUN-12
MAR-12
MAY-12     01-MAY-12
NOV-12
OCT-12
SEP-12     Regards,
P.

HP QUERY DATA ERROR((SQLER=ORA01476 divisor is equal to zero

Experts,
We are seeing the following error in Inventory Optimization Horizontal Plan
HP QUERY DATA ERROR((SQLER=ORA01476 divisor is equal to zero
Navigation
Sign on as Inventory Planner responsibility, Inventory Plan > Workbench
Select the plan owning org, so you can see all orgs.
View by organizations
Select org: <Org Code>
Select Category <category>,
item <Item name
Right click, select Horizontal Plan > Default
Can you help please.

Well the easiest way to troubleshoot this problem would be to find the row where FBASEVOLTAGE = 0. Something like this maybe:
SELECT BV.FBASEVOLTAGE
     , FB.FMAGNITUDE_RESULT
     , BS.IUBUSNO
FROM                       GN
JOIN                       GM ON GM.IELEMENT_MAP_ID = GN.IELEMENT_MAP_ID
JOIN                       BS ON GM.NPS_ELEMENT_ID   = BS.IUBUSID
                              AND GM.NPS_ELEMENT_TYPE = 101
JOIN   CONFIG_BASE_VOLTAGE BV ON BS.IBASEVOLTAGEID   = BV.IBASEVOLTAGEID
JOIN   FACT_BUS            FB ON FB.IBUS_NO          = BS.IUBUSID
                              AND FB.IPS_CASE_ID      = GN.IPS_CASE_ID
WHERE BV.FBASEVOLTAGE = 0
AND   GN.IPS_CASE_ID = 1637
;

Divisor is equal to zero......Help...plz

Hi all.
I tried to get a tablespace and fragmentation information with blow script.
But I got an error(ORA-1476 : divisor is equal to zero)
How can I fix the script properly ?
Could anybody help me to fix the script?
Thanks in advance.
select tablespace_name,sum(obj_cnt) object_count,sum(ini_ext) init_ext,sum(nex_ex
t) next_ext,sum(byte)/1048576 bytesize,
(sum(byte)/1048576)- (sum(fbyte)/1048576) byteused,sum(fbyte)/1048576 bytefree,
sum(frags), sum(largest)/1048576 avail,
(sum(fbyte)/sum(byte))*100 free
from (select tablespace_name,0 obj_cnt,0 ini_ext,0 nex_ext, 0 byte, sum(bytes) fb
yte, count(*) frags, max(bytes) largest
from dba_free_space
group by tablespace_name
union
select tablespace_name,0, 0, 0, sum(bytes), 0, 0, 0 from dba_data_files
group by tablespace_name
union
select tablespace_name, 0, initial_extent/1024 ini_ext, next_extent/1024 nex_ext,
0,0,0,0
from dba_tablespaces
union
select tablespace_name, count(*) obj_cnt, 0, 0, 0, 0, 0, 0
from dba_segments
group by tablespace_name)
group by tablespace_name

The various NVL and DECODE solutions may get rid of the error, but will not get you the correct answer. By the way, you may want to look at the differences in behaviour between
(sum(fbyte)/decode(sum(byte),0,NULL))*100 free and
(sum(fbyte)/decode(sum(byte),0,1))*100 free before you use either.
Your real problem is that you have a temp tablespace using temporary files. This is the right thing to do, but, you need another union in your statement, to access dba_temp_files:
SELECT tablespace_name,SUM(obj_cnt) object_count,
       SUM(ini_ext) init_ext, SUM(nex_ext) next_ext,
       SUM(byte)/1048576 bytesize,
       (SUM(byte)/1048576)- (SUM(fbyte)/1048576) byteused,
       SUM(fbyte)/1048576 bytefree, SUM(frags), SUM(largest)/1048576 avail,
       (SUM(fbyte)/SUM(byte))*100 free
FROM (SELECT tablespace_name, 0 obj_cnt, 0 ini_ext, 0 nex_ext, 0 byte,
             SUM(bytes) fbyte, COUNT(*) frags, MAX(bytes) largest
      FROM dba_free_space
      GROUP BY tablespace_name
      UNION ALL
      SELECT tablespace_name,0, 0, 0, sum(bytes), 0, 0, 0
      FROM dba_data_files
      GROUP BY tablespace_name
      UNION ALL
      SELECT tablespace_name,0, 0, 0, sum(bytes), 0, 0, 0
FROM dba_temp_files
GROUP BY tablespace_name
      UNION ALL
      SELECT tablespace_name, 0, initial_extent/1024 ini_ext,
             next_extent/1024 nex_ext, 0,0,0,0
      FROM dba_tablespaces
      UNION ALL
      SELECT tablespace_name, COUNT(*) obj_cnt, 0, 0, 0, 0, 0, 0
      FROM dba_segments
      GROUP BY tablespace_name)
GROUP BY tablespace_nameYou should also use UNION ALL instead of UNION, because UNION implies a sort distinct, whil union all does not. The sort is unneccessary, and the distinct may cause you to lose rows.
TTFn
John

Divisor is equal to zero error

Hi, I am getting divisor is equal to zero error while doing a calculation using sql. Is there a workaround this ?
Thanks

What do you want to do, if the divisor is 0?
Is the SQL executed in SqlPlus or in a procedure/function?
Hi, I am getting divisor is equal to zero error while doing a calculation using sql. Is there a workaround this ?
Thanks

How can i resolve divisor is equal to zero

hi,
i have the situation like i am calculating the column values. in that one field divided by other. but in that divisor field have zero. for that it's giving the error.
please help to do so...
example: select 8/o from dual;
error: ora-01476divisor equal to zero

indra wrote:
i have the situation like i am calculating the column values. in that one field divided by other. but in that divisor field have zero. for that it's giving the error.Either exclude it by adding:
divisor != 0to WHERE clause or use:
CASE divisor
WHEN 0 THEN whatever_result_you_want_for_zero_divisor
ELSE divident / divisor
ENDSY.
Edited by: Solomon Yakobson on Sep 19, 2011 6:47 AM

Error in add row internal routine: ORA-01476: divisor is equal to zero

Hi,
I am using Tabular Form Report in my application. So, when the user enters the page for the first time, no fields appear (if he has previously not entered any values in the DB). So to avoid this I added a Data Manipulation process-> Add rows to tabular Form ->On load after footer, so that when the user logins whether he entered previous values or not, he can see some empty fields, but this is not working as expected.
Any ideas how to resolve this issue.

Hmm other people have had this errorm found this hope it helps,
Hi,
Have a look at: Re: Add Row in detail table when check box is checked on a master report table as this shows how you can use javascript to clone a row

Ora-01476 divisor is equal to zero

hi!
ROUND(SUM(VALOR_VDA) / SUM(DECODE(QTDE_VDA,0,1,QTDE_VDA)),2)
Oracle 10.2.0.1.0
Red Hat Enterprise 5

is this QTDE_VDA field numeric
The only issues here with the decode is see is if the total value of all the rows when summed is 0 - zero then you will have zero-divide error
SS
Message was edited by:
user478316

Capturing oracle error codes into a variable

Hi
Can someone show me how it is possible to save an Oracle defined error code into a variable? What I am trying to do is when a stored procedure fails an Oracle error is raised, such as ORA-xxxx, then pass this code into variable to be saved into a log.
How do I achieve this?

user633278 wrote:
How do I achieve this?Function SQLCODE in PL/SQL exception handler returns error code. SQLERRM returns message:
SQL> declare
2      x number;
3 begin
4      x := 1/0;
5    exception
6      when others
7        then
8          dbms_output.put_line('Error code: ' || SQLCODE);
9          dbms_output.put_line('Error message: ' || SQLERRM);
10 end;
11 /
Error code: -1476
Error message: ORA-01476: divisor is equal to zero
PL/SQL procedure successfully completed.
SQL> SY.

Tweak for sql query - help needed for smalll change

Hi.
I am trying to run a script that checks for used space on all tablespaces and returns the results.
So far so good:
set lines 200 pages 2000
col tablespace_name heading 'Tablespace' format a30 truncate
col total_maxspace_mb heading 'MB|Max Size' format 9G999G999
col total_allocspace_mb heading 'MB|Allocated' format 9G999G999
col used_space_mb heading 'MB|Used' format 9G999G999D99
col free_space_mb heading 'MB|Free Till Max' like used_space_mb
col free_space_ext_mb heading 'MB|Free Till Ext' like used_space_mb
col pct_used heading '%|Used' format 999D99
col pct_free heading '%|Free' like pct_used
break on report
compute sum label 'Total Size:' of total_maxspace_mb total_allocspace_mb used_space_mb - free_space_mb (used_space_mb/total_maxspace_mb)*100 on report
select
alloc.tablespace_name,
(alloc.total_allocspace_mb - free.free_space_mb) used_space_mb,
free.free_space_mb free_space_ext_mb,
((alloc.total_allocspace_mb - free.free_space_mb)/alloc.total_maxspace_mb)*100 pct_used,
((free.free_space_mb+(alloc.total_maxspace_mb-alloc.total_allocspace_mb))/alloc.total_maxspace_mb)*100 pct_free
FROM (SELECT tablespace_name,
ROUND(SUM(CASE WHEN maxbytes = 0 THEN bytes ELSE maxbytes END)/1048576) total_maxspace_mb,
ROUND(SUM(bytes)/1048576) total_allocspace_mb
FROM dba_data_files
WHERE file_id NOT IN (SELECT FILE# FROM v$recover_file)
GROUP BY tablespace_name) alloc,
(SELECT tablespace_name,
SUM(bytes)/1048576 free_space_mb
FROM dba_free_space
WHERE file_id NOT IN (SELECT FILE# FROM v$recover_file)
GROUP BY tablespace_name) free
WHERE alloc.tablespace_name = free.tablespace_name (+)
ORDER BY pct_used DESC
The above returns something like this:
MB MB % %
Tablespace Used Free Till Ext Used Free
APPS_TS_ARCHIVE 1,993.13 54.88 97.32 2.68
APPS_TS_TX_IDX 14,756.13 1,086.88 91.37 8.63
APPS_TS_TX_DATA 20,525.75 594.25 80.18 19.82
APPS_TS_MEDIA 6,092.00 180.00 74.37 25.63
APPS_TS_INTERFACE 13,177.63 366.38 71.49 28.51
The above works fine, but I would like to further change the query so that only those tablespaces with free space less than 5% (or used space more than 95%) are returned.
I have been working on this all morning and wanted to open it up to the masters!
I have tried using WHERE pct_used > 95 but to no avail.
Any advice would be appreciated.
Many thanks.
10.2.0.4
Linux Red Hat 4.

Thanks for that.
What is confusing is that the below query works for every other (about 10 others) database but not this one (?)
SQL> set lines 200 pages 2000
SQL>
SQL> col tablespace_name heading 'Tablespace' format a30 truncate
SQL> col total_maxspace_mb heading 'MB|Max Size' format 9G999G999
SQL> col total_allocspace_mb heading 'MB|Allocated' format 9G999G999
SQL> col used_space_mb heading 'MB|Used' format 9G999G999D99
SQL> col free_space_mb heading 'MB|Free Till Max' like used_space_mb
SQL> col free_space_ext_mb heading 'MB|Free Till Ext' like used_space_mb
SQL> col pct_used heading '%|Used' format 999D99
SQL> col pct_free heading '%|Free' like pct_used
SQL>
SQL> break on report
SQL> compute sum label 'Total Size:' of total_maxspace_mb total_allocspace_mb used_space_mb - free_space_mb (used_space_mb/total_maxspace_mb)*100 on report
SQL>
SQL> select /*+ALL_ROWS */
2 alloc.tablespace_name,
3 alloc.total_maxspace_mb,
4 alloc.total_allocspace_mb,
5 (alloc.total_allocspace_mb - free.free_space_mb) used_space_mb,
6 free.free_space_mb+(alloc.total_maxspace_mb-alloc.total_allocspace_mb) free_space_mb,
7 free.free_space_mb free_space_ext_mb,
8 ((alloc.total_allocspace_mb - free.free_space_mb)/alloc.total_maxspace_mb)*100 pct_used,
9 ((free.free_space_mb+(alloc.total_maxspace_mb-alloc.total_allocspace_mb))/alloc.total_maxspace_mb)*100 pct_free
10 FROM (SELECT tablespace_name,
11 ROUND(SUM(CASE WHEN maxbytes = 0 THEN bytes ELSE maxbytes END)/1048576) total_maxspace_mb,
12 ROUND(SUM(bytes)/1048576) total_allocspace_mb
13 FROM dba_data_files
14 WHERE file_id NOT IN (SELECT FILE# FROM v$recover_file)
15 GROUP BY tablespace_name) alloc,
16 (SELECT tablespace_name,
17 SUM(bytes)/1048576 free_space_mb
18 FROM dba_free_space
19 WHERE file_id NOT IN (SELECT FILE# FROM v$recover_file)
20 GROUP BY tablespace_name) free
21 WHERE alloc.tablespace_name = free.tablespace_name (+)
22 ORDER BY pct_used DESC
23 /
((alloc.total_allocspace_mb - free.free_space_mb)/alloc.total_maxspace_mb)*100 pct_used,
ERROR at line 8:
ORA-01476: divisor is equal to zero

PL/SQL 101 : Exception Handling

Frequently I see questions and issues around the use of Exception/Error Handling in PL/SQL. More often than not the issue comes from the questioners misunderstanding about how PL/SQL is constructed and executed, so I thought I'd write a small article covering the key concepts to give a clear picture of how it all hangs together. (Note: the examples are just showing examples of the exception handling structure, and should not be taken as truly valid code for ways of handling things)
Exception Handling
Contents
1. Understanding Execution Blocks (part 1)
2. Execution of the Execution Block
3. Exceptions
4. Understanding Execution Blocks (part 2)
5. How to continue exection of statements after an exception
6. User defined exceptions
7. Line number of exception
8. Exceptions within code within the exception block
1. Understanding Execution Blocks (part 1)
The first thing that one needs to understand is almost taking us back to the basics of PL/SQL... how a PL/SQL execution block is constructed.
Essentially an execution block is made of 3 sections...
+---------------------------+
|    Declaration Section    |
+---------------------------+
|    Statements Section    |
+---------------------------+
|     Exception Section     |
+---------------------------+
The Declaration section is the part defined between the PROCEDURE/FUNCTION header or the DECLARE keyword (for anonymous blocks) and the BEGIN keyword. (Optional section)
The Statements section is where your code goes and lies between the BEGIN keyword and the EXCEPTION keyword (or END keyword if there is no EXCEPTION section). (Mandatory section)
The Exception section is where any exception handling goes and lies between the EXCEPTION keyword at the END keyword. (Optional section)
Example of an anonymous block...
DECLARE
.. declarative statements go here ..
BEGIN
.. code statements go here ..
EXCEPTION
.. exception handlers go here ..
END;
Example of a procedure/function block...
[CREATE OR REPLACE] (PROCEDURE|FUNCTION) <proc or fn name> [(<parameters>)] [RETURN <datatype>] (IS|AS)
.. declarative statements go here ..
BEGIN
.. code statements go here ..
EXCEPTION
.. exception handlers go here ..
END;
(Note: The same can also be done for packages, but let's keep it simple)
2. Execution of the Execution Block
This may seem a simple concept, but it's surprising how many people have issues showing they haven't grasped it. When an Execution block is entered, the declaration section is processed, creating a scope of variables, types , cursors, etc. to be visible to the execution block and then execution enters into the Statements section. Each statment in the statements section is executed in turn and when the execution completes the last statment the execution block is exited back to whatever called it.
3. Exceptions
Exceptions generally happen during the execution of statements in the Statements section. When an exception happens the execution of statements jumps immediately into the exception section. In this section we can specify what exceptions we wish to 'capture' or 'trap' and do one of the two following things...
(Note: The exception section still has access to all the declared items in the declaration section)
3.i) Handle the exception
We do this when we recognise what the exception is (most likely it's something we expect to happen) and we have a means of dealing with it so that our application can continue on.
Example...
(without the exception handler the exception is passed back to the calling code, in this case SQL*Plus)
SQL> ed
Wrote file afiedt.buf
1 declare
2    v_name VARCHAR2(20);
3 begin
4    select ename
5    into   v_name
6    from   emp
7    where empno = &empno;
8    dbms_output.put_line(v_name);
9* end;
SQL> /
Enter value for empno: 123
old   7:   where empno = &empno;
new   7:   where empno = 123;
declare
ERROR at line 1:
ORA-01403: no data found
ORA-06512: at line 4
(with an exception handler, we capture the exception, handle it how we want to, and the calling code is happy that there is no error for it to report)
SQL> ed
Wrote file afiedt.buf
1 declare
2    v_name VARCHAR2(20);
3 begin
4    select ename
5    into   v_name
6    from   emp
7    where empno = &empno;
8    dbms_output.put_line(v_name);
9 exception
10    when no_data_found then
11      dbms_output.put_line('There is no employee with this employee number.');
12* end;
SQL> /
Enter value for empno: 123
old   7:   where empno = &empno;
new   7:   where empno = 123;
There is no employee with this employee number.
PL/SQL procedure successfully completed.
3.ii) Raise the exception
We do this when:-
a) we recognise the exception, handle it but still want to let the calling code know that it happened
b) we recognise the exception, wish to log it happened and then let the calling code deal with it
c) we don't recognise the exception and we want the calling code to deal with it
Example of b)
SQL> ed
Wrote file afiedt.buf
1 declare
2    v_name VARCHAR2(20);
3    v_empno NUMBER := &empno;
4 begin
5    select ename
6    into   v_name
7    from   emp
8    where empno = v_empno;
9    dbms_output.put_line(v_name);
10 EXCEPTION
11    WHEN no_data_found THEN
12      INSERT INTO sql_errors (txt)
13      VALUES ('Search for '||v_empno||' failed.');
14      COMMIT;
15      RAISE;
16* end;
SQL> /
Enter value for empno: 123
old   3:   v_empno NUMBER := &empno;
new   3:   v_empno NUMBER := 123;
declare
ERROR at line 1:
ORA-01403: no data found
ORA-06512: at line 15
SQL> select * from sql_errors;
TXT
Search for 123 failed.
SQL>
Example of c)
SQL> ed
Wrote file afiedt.buf
1 declare
2    v_name VARCHAR2(20);
3    v_empno NUMBER := &empno;
4 begin
5    select ename
6    into   v_name
7    from   emp
8    where empno = v_empno;
9    dbms_output.put_line(v_name);
10 EXCEPTION
11    WHEN no_data_found THEN
12      INSERT INTO sql_errors (txt)
13      VALUES ('Search for '||v_empno||' failed.');
14      COMMIT;
15      RAISE;
16    WHEN others THEN
17      RAISE;
18* end;
SQL> /
Enter value for empno: 'ABC'
old   3:   v_empno NUMBER := &empno;
new   3:   v_empno NUMBER := 'ABC';
declare
ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error: character to number conversion error
ORA-06512: at line 3
SQL> select * from sql_errors;
TXT
Search for 123 failed.
SQL>
As you can see from the sql_errors log table, no log was written so the WHEN others exception was the exception that raised the error to the calling code (SQL*Plus)
4. Understanding Execution Blocks (part 2)
Ok, so now we understand the very basics of an execution block and what happens when an exception happens. Let's take it a step further...
Execution blocks are not just a single simple block in most cases. Often, during our statements section we have a need to call some reusable code and we do that by calling a procedure or function. Effectively this nests the procedure or function's code as another execution block within the current statement section so, in terms of execution, we end up with something like...
+---------------------------------+
|    Declaration Section          |
+---------------------------------+
|    Statements Section          |
|            .                    |
| +---------------------------+ |
| |    Declaration Section    | |
| +---------------------------+ |
| |    Statements Section    | |
| +---------------------------+ |
| |     Exception Section     | |
| +---------------------------+ |
|            .                    |
+---------------------------------+
|     Exception Section           |
+---------------------------------+
Example... (Note: log_trace just writes some text to a table for tracing)
SQL> create or replace procedure a as
2    v_dummy NUMBER := log_trace('Procedure A''s Declaration Section');
3 begin
4    v_dummy := log_trace('Procedure A''s Statement Section');
5    v_dummy := 1/0; -- cause an exception
6 exception
7    when others then
8      v_dummy := log_trace('Procedure A''s Exception Section');
9      raise;
10 end;
11 /
Procedure created.
SQL> create or replace procedure b as
2    v_dummy NUMBER := log_trace('Procedure B''s Declaration Section');
3 begin
4    v_dummy := log_trace('Procedure B''s Statement Section');
5    a; -- HERE the execution passes to the declare/statement/exception sections of A
6 exception
7    when others then
8      v_dummy := log_trace('Procedure B''s Exception Section');
9      raise;
10 end;
11 /
Procedure created.
SQL> exec b;
BEGIN b; END;
ERROR at line 1:
ORA-01476: divisor is equal to zero
ORA-06512: at "SCOTT.B", line 9
ORA-06512: at line 1
SQL> select * from code_trace;
TXT
Procedure B's Declaration Section
Procedure B's Statement Section
Procedure A's Declaration Section
Procedure A's Statement Section
Procedure A's Exception Section
Procedure B's Exception Section
6 rows selected.
SQL>
Likewise, execution blocks can be nested deeper and deeper.
5. How to continue exection of statements after an exception
One of the common questions asked is how to return execution to the statement after the one that created the exception and continue on.
Well, firstly, you can only do this for statements you expect to raise an exception, such as when you want to check if there is no data found in a query.
If you consider what's been shown above you could put any statement you expect to cause an exception inside it's own procedure or function with it's own exception section to handle the exception without raising it back to the calling code. However, the nature of procedures and functions is really to provide a means of re-using code, so if it's a statement you only use once it seems a little silly to go creating individual procedures for these.
Instead, you nest execution blocks directly, to give the same result as shown in the diagram at the start of part 4 of this article.
SQL> ed
Wrote file afiedt.buf
1 create or replace procedure b (p_empno IN VARCHAR2) as
2    v_dummy NUMBER := log_trace('Procedure B''s Declaration Section');
3 begin
4    v_dummy := log_trace('Procedure B''s Statement Section');
5    -- Here we start another execution block nested in the first one...
6    declare
7      v_dummy NUMBER := log_trace('Nested Block Declaration Section');
8    begin
9      v_dummy := log_trace('Nested Block Statement Section');
10      select empno
11        into   v_dummy
12        from   emp
13       where empno = p_empno; -- Note: the parameters and variables from
                                     parent execution block are available to use!
14    exception
15      when no_data_found then
16        -- This is an exception we can handle so we don't raise it
17        v_dummy := log_trace('No employee was found');
18        v_dummy := log_trace('Nested Block Exception Section - Exception Handled');
19      when others then
20        -- Other exceptions we can't handle so we raise them
21        v_dummy := log_trace('Nested Block Exception Section - Exception Raised');
22        raise;
23    end;
24    -- ...Here endeth the nested execution block
25    -- As the nested block handled it's exception we come back to here...
26    v_dummy := log_trace('Procedure B''s Statement Section Continued');
27 exception
28    when others then
29      -- We'll only get to here if an unhandled exception was raised
30      -- either in the nested block or in procedure b's statement section
31      v_dummy := log_trace('Procedure B''s Exception Section');
32      raise;
33* end;
SQL> /
Procedure created.
SQL> exec b(123);
PL/SQL procedure successfully completed.
SQL> select * from code_trace;
TXT
Procedure B's Declaration Section
Procedure B's Statement Section
Nested Block Declaration Section
Nested Block Statement Section
No employee was found
Nested Block Exception Section - Exception Handled
Procedure B's Statement Section Continued
7 rows selected.
SQL> truncate table code_trace;
Table truncated.
SQL> exec b('ABC');
BEGIN b('ABC'); END;
ERROR at line 1:
ORA-01722: invalid number
ORA-06512: at "SCOTT.B", line 32
ORA-06512: at line 1
SQL> select * from code_trace;
TXT
Procedure B's Declaration Section
Procedure B's Statement Section
Nested Block Declaration Section
Nested Block Statement Section
Nested Block Exception Section - Exception Raised
Procedure B's Exception Section
6 rows selected.
SQL>
You can see from this that, very simply, the code that we expected may have an exception was able to either handle the exception and return to the outer execution block to continue execution, or if an unexpected exception occurred then it was able to be raised up to the outer exception section.
6. User defined exceptions
There are three sorts of 'User Defined' exceptions. There are logical situations (e.g. business logic) where, for example, certain criteria are not met to complete a task, and there are existing Oracle errors that you wish to give a name to in order to capture them in the exception section. The third is raising your own exception messages with our own exception numbers. Let's look at the first one...
Let's say I have tables which detail stock availablility and reorder levels...
SQL> select * from reorder_level;
   ITEM_ID STOCK_LEVEL
         1          20
         2          20
         3          10
         4           2
         5           2
SQL> select * from stock;
   ITEM_ID ITEM_DESC STOCK_LEVEL
         1 Pencils             10
         2 Pens                 2
         3 Notepads            25
         4 Stapler              5
         5 Hole Punch           3
SQL>
Now, our Business has told the administrative clerk to check stock levels and re-order anything that is below the re-order level, but not to hold stock of more than 4 times the re-order level for any particular item. As an IT department we've been asked to put together an application that will automatically produce the re-order documents upon the clerks request and, because our company is so tight-ar*ed about money, they don't want to waste any paper with incorrect printouts so we have to ensure the clerk can't order things they shouldn't.
SQL> ed
Wrote file afiedt.buf
1 create or replace procedure re_order(p_item_id NUMBER, p_quantity NUMBER) is
2    cursor cur_stock_reorder is
3      select s.stock_level
4            ,r.stock_level as reorder_level
5            ,(r.stock_level*4) as reorder_limit
6      from stock s join reorder_level r on (s.item_id = r.item_id)
7      where s.item_id = p_item_id;
8    --
9    v_stock cur_stock_reorder%ROWTYPE;
10 begin
11    OPEN cur_stock_reorder;
12    FETCH cur_stock_reorder INTO v_stock;
13    IF cur_stock_reorder%NOTFOUND THEN
14      RAISE no_data_found;
15    END IF;
16    CLOSE cur_stock_reorder;
17    --
18    IF v_stock.stock_level >= v_stock.reorder_level THEN
19      -- Stock is not low enough to warrant an order
20      DBMS_OUTPUT.PUT_LINE('Stock has not reached re-order level yet!');
21    ELSE
22      IF v_stock.stock_level + p_quantity > v_stock.reorder_limit THEN
23        -- Required amount is over-ordering
24        DBMS_OUTPUT.PUT_LINE('Quantity specified is too much. Max for this item: '
                                 ||to_char(v_stock.reorder_limit-v_stock.stock_level));
25      ELSE
26        DBMS_OUTPUT.PUT_LINE('Order OK. Printing Order...');
27        -- Here goes our code to print the order
28      END IF;
29    END IF;
30    --
31 exception
32    WHEN no_data_found THEN
33      CLOSE cur_stock_reorder;
34      DBMS_OUTPUT.PUT_LINE('Invalid Item ID.');
35* end;
SQL> /
Procedure created.
SQL> exec re_order(10,100);
Invalid Item ID.
PL/SQL procedure successfully completed.
SQL> exec re_order(3,40);
Stock has not reached re-order level yet!
PL/SQL procedure successfully completed.
SQL> exec re_order(1,100);
Quantity specified is too much. Max for this item: 70
PL/SQL procedure successfully completed.
SQL> exec re_order(2,50);
Order OK. Printing Order...
PL/SQL procedure successfully completed.
SQL>
Ok, so that code works, but it's a bit messy with all those nested IF statements. Is there a cleaner way perhaps? Wouldn't it be nice if we could set up our own exceptions...
SQL> ed
Wrote file afiedt.buf
1 create or replace procedure re_order(p_item_id NUMBER, p_quantity NUMBER) is
2    cursor cur_stock_reorder is
3      select s.stock_level
4            ,r.stock_level as reorder_level
5            ,(r.stock_level*4) as reorder_limit
6      from stock s join reorder_level r on (s.item_id = r.item_id)
7      where s.item_id = p_item_id;
8    --
9    v_stock cur_stock_reorder%ROWTYPE;
10    --
11    -- Let's declare our own exceptions for business logic...
12    exc_not_warranted EXCEPTION;
13    exc_too_much      EXCEPTION;
14 begin
15    OPEN cur_stock_reorder;
16    FETCH cur_stock_reorder INTO v_stock;
17    IF cur_stock_reorder%NOTFOUND THEN
18      RAISE no_data_found;
19    END IF;
20    CLOSE cur_stock_reorder;
21    --
22    IF v_stock.stock_level >= v_stock.reorder_level THEN
23      -- Stock is not low enough to warrant an order
24      RAISE exc_not_warranted;
25    END IF;
26    --
27    IF v_stock.stock_level + p_quantity > v_stock.reorder_limit THEN
28      -- Required amount is over-ordering
29      RAISE exc_too_much;
30    END IF;
31    --
32    DBMS_OUTPUT.PUT_LINE('Order OK. Printing Order...');
33    -- Here goes our code to print the order
34    --
35 exception
36    WHEN no_data_found THEN
37      CLOSE cur_stock_reorder;
38      DBMS_OUTPUT.PUT_LINE('Invalid Item ID.');
39    WHEN exc_not_warranted THEN
40      DBMS_OUTPUT.PUT_LINE('Stock has not reached re-order level yet!');
41    WHEN exc_too_much THEN
42      DBMS_OUTPUT.PUT_LINE('Quantity specified is too much. Max for this item: '
                              ||to_char(v_stock.reorder_limit-v_stock.stock_level));
43* end;
SQL> /
Procedure created.
SQL> exec re_order(10,100);
Invalid Item ID.
PL/SQL procedure successfully completed.
SQL> exec re_order(3,40);
Stock has not reached re-order level yet!
PL/SQL procedure successfully completed.
SQL> exec re_order(1,100);
Quantity specified is too much. Max for this item: 70
PL/SQL procedure successfully completed.
SQL> exec re_order(2,50);
Order OK. Printing Order...
PL/SQL procedure successfully completed.
SQL>
That's better. And now we don't have to use all those nested IF statements and worry about it accidently getting to code that will print the order out as, once one of our user defined exceptions is raised, execution goes from the Statements section into the Exception section and all handling of errors is done in one place.
Now for the second sort of user defined exception...
A new requirement has come in from the Finance department who want to have details shown on the order that show a re-order 'indicator' based on the formula ((maximum allowed stock - current stock)/re-order quantity), so this needs calculating and passing to the report...
SQL> ed
Wrote file afiedt.buf
1 create or replace procedure re_order(p_item_id NUMBER, p_quantity NUMBER) is
2    cursor cur_stock_reorder is
3      select s.stock_level
4            ,r.stock_level as reorder_level
5            ,(r.stock_level*4) as reorder_limit
6            ,(((r.stock_level*4)-s.stock_level)/p_quantity) as finance_factor
7      from stock s join reorder_level r on (s.item_id = r.item_id)
8      where s.item_id = p_item_id;
9    --
10    v_stock cur_stock_reorder%ROWTYPE;
11    --
12    -- Let's declare our own exceptions for business logic...
13    exc_not_warranted EXCEPTION;
14    exc_too_much      EXCEPTION;
15 begin
16    OPEN cur_stock_reorder;
17    FETCH cur_stock_reorder INTO v_stock;
18    IF cur_stock_reorder%NOTFOUND THEN
19      RAISE no_data_found;
20    END IF;
21    CLOSE cur_stock_reorder;
22    --
23    IF v_stock.stock_level >= v_stock.reorder_level THEN
24      -- Stock is not low enough to warrant an order
25      RAISE exc_not_warranted;
26    END IF;
27    --
28    IF v_stock.stock_level + p_quantity > v_stock.reorder_limit THEN
29      -- Required amount is over-ordering
30      RAISE exc_too_much;
31    END IF;
32    --
33    DBMS_OUTPUT.PUT_LINE('Order OK. Printing Order...');
34    -- Here goes our code to print the order, passing the finance_factor
35    --
36 exception
37    WHEN no_data_found THEN
38      CLOSE cur_stock_reorder;
39      DBMS_OUTPUT.PUT_LINE('Invalid Item ID.');
40    WHEN exc_not_warranted THEN
41      DBMS_OUTPUT.PUT_LINE('Stock has not reached re-order level yet!');
42    WHEN exc_too_much THEN
43      DBMS_OUTPUT.PUT_LINE('Quantity specified is too much. Max for this item: '
                              ||to_char(v_stock.reorder_limit-v_stock.stock_level));
44* end;
SQL> /
Procedure created.
SQL> exec re_order(2,40);
Order OK. Printing Order...
PL/SQL procedure successfully completed.
SQL> exec re_order(2,0);
BEGIN re_order(2,0); END;
ERROR at line 1:
ORA-01476: divisor is equal to zero
ORA-06512: at "SCOTT.RE_ORDER", line 17
ORA-06512: at line 1
SQL>
Hmm, there's a problem if the person specifies a re-order quantity of zero. It raises an unhandled exception.
Well, we could put a condition/check into our code to make sure the parameter is not zero, but again we would be wrapping our code in an IF statement and not dealing with the exception in the exception handler.
We could do as we did before and just include a simple IF statement to check the value and raise our own user defined exception but, in this instance the error is standard Oracle error (ORA-01476) so we should be able to capture it inside the exception handler anyway... however...
EXCEPTION
WHEN ORA-01476 THEN
... is not valid. What we need is to give this Oracle error a name.
This is done by declaring a user defined exception as we did before and then associating that name with the error number using the PRAGMA EXCEPTION_INIT statement in the declaration section.
SQL> ed
Wrote file afiedt.buf
1 create or replace procedure re_order(p_item_id NUMBER, p_quantity NUMBER) is
2    cursor cur_stock_reorder is
3      select s.stock_level
4            ,r.stock_level as reorder_level
5            ,(r.stock_level*4) as reorder_limit
6            ,(((r.stock_level*4)-s.stock_level)/p_quantity) as finance_factor
7      from stock s join reorder_level r on (s.item_id = r.item_id)
8      where s.item_id = p_item_id;
9    --
10    v_stock cur_stock_reorder%ROWTYPE;
11    --
12    -- Let's declare our own exceptions for business logic...
13    exc_not_warranted EXCEPTION;
14    exc_too_much      EXCEPTION;
15    --
16    exc_zero_quantity EXCEPTION;
17    PRAGMA EXCEPTION_INIT(exc_zero_quantity, -1476);
18 begin
19    OPEN cur_stock_reorder;
20    FETCH cur_stock_reorder INTO v_stock;
21    IF cur_stock_reorder%NOTFOUND THEN
22      RAISE no_data_found;
23    END IF;
24    CLOSE cur_stock_reorder;
25    --
26    IF v_stock.stock_level >= v_stock.reorder_level THEN
27      -- Stock is not low enough to warrant an order
28      RAISE exc_not_warranted;
29    END IF;
30    --
31    IF v_stock.stock_level + p_quantity > v_stock.reorder_limit THEN
32      -- Required amount is over-ordering
33      RAISE exc_too_much;
34    END IF;
35    --
36    DBMS_OUTPUT.PUT_LINE('Order OK. Printing Order...');
37    -- Here goes our code to print the order, passing the finance_factor
38    --
39 exception
40    WHEN exc_zero_quantity THEN
41      DBMS_OUTPUT.PUT_LINE('Quantity of 0 (zero) is invalid.');
42    WHEN no_data_found THEN
43      CLOSE cur_stock_reorder;
44      DBMS_OUTPUT.PUT_LINE('Invalid Item ID.');
45    WHEN exc_not_warranted THEN
46      DBMS_OUTPUT.PUT_LINE('Stock has not reached re-order level yet!');
47    WHEN exc_too_much THEN
48      DBMS_OUTPUT.PUT_LINE('Quantity specified is too much. Max for this item: '
                              ||to_char(v_stock.reorder_limit-v_stock.stock_level));
49* end;
SQL> /
Procedure created.
SQL> exec re_order(2,0);
Quantity of 0 (zero) is invalid.
PL/SQL procedure successfully completed.
SQL>
Lastly, let's look at raising our own exceptions with our own exception numbers...
SQL> ed
Wrote file afiedt.buf
1 create or replace procedure re_order(p_item_id NUMBER, p_quantity NUMBER) is
2    cursor cur_stock_reorder is
3      select s.stock_level
4            ,r.stock_level as reorder_level
5            ,(r.stock_level*4) as reorder_limit
6            ,(((r.stock_level*4)-s.stock_level)/p_quantity) as finance_factor
7      from stock s join reorder_level r on (s.item_id = r.item_id)
8      where s.item_id = p_item_id;
9    --
10    v_stock cur_stock_reorder%ROWTYPE;
11    --
12    exc_zero_quantity EXCEPTION;
13    PRAGMA EXCEPTION_INIT(exc_zero_quantity, -1476);
14 begin
15    OPEN cur_stock_reorder;
16    FETCH cur_stock_reorder INTO v_stock;
17    IF cur_stock_reorder%NOTFOUND THEN
18      RAISE no_data_found;
19    END IF;
20    CLOSE cur_stock_reorder;
21    --
22    IF v_stock.stock_level >= v_stock.reorder_level THEN
23      -- Stock is not low enough to warrant an order
24      [b]RAISE_APPLICATION_ERROR(-20000, 'Stock has not reached re-order level yet!');[/b]
25    END IF;
26    --
27    IF v_stock.stock_level + p_quantity > v_stock.reorder_limit THEN
28      -- Required amount is over-ordering
29

its nice article, have put up this one the blog
site,Nah, I don't have time to blog, but if one of the other Ace's/Experts wants to copy it to a blog with reference back to here (and all due credit given ;)) then that's fine by me.
I'd go for a book like "Selected articles by OTN members" or something. Does anybody have a list of links of all those mentioned articles?Just these ones I've bookmarked...
Introduction to regular expressions ... by CD
When your query takes too long ... by Rob van Wijk
How to pipeline a function with a dynamic number of columns? by ascheffer
PL/SQL 101 : Exception Handling by BluShadow

What is the difference between "= NULL" and "IS NULL" in SQL?

Hi,
I believe there is a difference between "= NULL" and "IS NULL" comparsion, but I couldn't find it. Anyone knows the difference?
Thanks,
Denny

Aha, thanks:
SQL> create table william_test_tab (col binary_double);
Table created.
SQL> insert into william_test_tab
2 select rownum / (rownum - 1) from user_tables where rownum < 4;
select rownum / (rownum - 1) from user_tables where rownum < 4
ERROR at line 2:
ORA-01476: divisor is equal to zero
SQL> insert into william_test_tab
2 select 1d * rownum / (rownum - 1) from user_tables where rownum < 4;
3 rows created.
SQL> select * from william_test_tab;
       COL
       Inf
2.0E+000
1.5E+000
3 rows selected.
SQL> select * from william_test_tab where col is infinite;
       COL
       Inf
1 row selected.
SQL>

Error when scheduling backup job in OEM

We have Oracle 11.2 RAC on Redhat Linux. I was creating an customized backup job and get the errorsORA-01476: divisor is equal to zero
ORA-06512: at "SYSMAN.MGMT_JOB_ENGINE", line 7544
ORA-06512: at "SYSMAN.MGMT_JOB_ENGINE", line 7699
ORA-06512: at "SYSMAN.MGMT_JOB_ENGINE", line 8211
ORA-06512: at "SYSMAN.MGMT_JOB_ENGINE", line 8342
ORA-06512: at "SYSMAN.MGMT_JOB_ENGINE", line 8503
ORA-06512: at "SYSMAN.MGMT_JOB_ENGINE", line 8570
ORA-06512: at "SYSMAN.MGMT_JOBS", line 273
ORA-06512: at "SYSMAN.MGMT_JOBS", line 86
ORA-06512: at line 1 The backup command is created by OEM as backup incremental level 0 cumulative device type disk filesperset = 5 tag '%TAG' section size 500 M database;
backup device type disk filesperset = 500 tag '%TAG' section size 500 M archivelog all not backed up;
allocate channel for maintenance type disk;
delete noprompt obsolete device type disk;
release channel; Actually using other ommand also get the same error.
What is wrong? I scheduled backup job before on this server and it worked.

This may be due to that the schedule frequecy is not set. Make sure Frequency Type and Repeat Every boxes get filled properly.

Divisor is equal to 0

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