Clarification on using function in where clause of oracle sql query

I have an issue in regarding function using where clause of sql query..
We are facing performance issue while executing query, so in what ways to improve the performance of the query which i have posted below.
select col ,case when my_function(parameter)
from tab1 a ,tab2 b,tabl3 c
where a.column1=b.column2
and b.column3 =c.column6
and my_function(parameter)>0
Regards
Dinesh
Edited by: wild fire on May 18, 2012 4:15 PM

Dinesh,
remind that when you use a function in the where clause it normally will get started for each record in the table.
So your answer is two-fold:
1. make the function only start when needed by adding a function based index on the table (this will make inserts and updates slower)
2. make the function faster by adding the DETERMINISTIC clause if possible. this will make Oracle "cache" the result of the function.
Regards,
Richard
blog: http://blog.warp11.nl
twitter: @rhjmartens
If this question is answered, please mark the thread as closed and assign points where earned..

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Using function in where clause

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create or replace FUNCTION get_codes RETURN varchar2 IS
scodes varchar2(50) := 'A1,A2';
BEGIN
scodes := '('''||REPLACE(scodes,',',''',''')||''')';
return scodes;
END;
this function returns ('A1','A2')
now i want to use this in where clause, both below statements fetches no rows
select * from tablea where code in (select get_codes from dual);
select * from tablea where code in get_codes;
but the following will fetch rows
select * from tablea where code in ('A1','A2')
how to use function in where clause
Thanks

Hi,
The code that works:
where code in ('A1','A2')is testing whther code is either of two 2-character strings, A1 or A2.
The ones that don't work, such as:
where code in get_codes;are comparing code to one 9-character string: 'A1','A2', where characters 1, 4, 6 and 9 are single-quotes. (The function can only return one value.)
You can use dynamic SQL to embed that 9-character string in part of your query, where it will be interpreted as two 2-character strrings.
[Oracle Base|http://www.oracle-base.com/articles/misc/DynamicInLists.php] and AskTom have good pages on the subject of dynamic IN-lists.
Of you can use INSTR or LIKE:
where INSTR ( get_codes
, '''' || code || ''''
) > 0

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Regd. using functions in where clause

Hi All,
I need to apply a set of functions in sysdate and use that in a where clause to compare. My question is, will these functions on sysdate be executed for every record in the tables that I use? Will this have performance impact when i have millions of records returned by the select?
Below is the scenario:
Select * from table A inner join table B on A.c1 = B.c1 where
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Regards,
Raj.D

1005330 wrote:
I need to apply a set of functions in sysdate and use that in a where clause to compare. My question is, will these functions on sysdate be executed for every record in the tables that I use? Will this have performance impact when i have millions of records returned by the select?
Below is the scenario:
Select * from table A inner join table B on A.c1 = B.c1 where
TO_NUMBER(TO_CHAR(TRUNC(LAST_DAY(ADD_MONTHS(SYSDATE, -1))),'YYYYMMDD')) BETWEEN Date1 and Date2
Test it on a small data set - run a query and check the execution plan to see what the predicate section tells you.
Oracle OUGHT to be smart enough to recognise that you've got a constant that it need only calculate once. If not, then change the usage to read:
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col1 <= constant
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Depending on your data patterns and the nature of the predicate there are alternative optimiisation strategies.
Regards
Jonathan Lewis

How to avoid repeat where clause in oracle sql

Hi,
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In my below query, **JOIN** condition is same for both the queries and **WHERE** condition also same except this clause "and code.code_name="transaction_1"
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select DAY as business_date,sum(amount) as AMOUNT, type_amnt as amount_type,test_code as code_seg
from
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CASE
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ELSE 'debit'
END as type_amnt,
"25.55" as amount
from
code_table code,
table1 table1_alias
join table2 table2_alias on table1_alias.id = table2_alias.id
where
table1_alias.state="OK"
and table1_alias.type="R"
and code.code_type="Movie"
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UNION ALL
select table1_alias.date as DAY,code.code_numb as test_code,
CASE
WHEN qnty_item > 0 THEN 'debit'
ELSE 'credit'
END as type_amnt,
"25.55" as amount
from
code_table code,
table1 table1_alias
join table2 table2_alias on table1_alias.id = table2_alias.id
where
table1_alias.state="OK"
and table1_alias.type="R"
and code.code_type="Movie"
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group by DAY, test_code,type_amnt
Thanks

user10624672 wrote:
Hi,
Please find my query below, I need a help to avoid duplication of **where** clause in my query.
In my below query, **JOIN** condition is same for both the queries and **WHERE** condition also same except this clause "and code.code_name="transaction_1"
In **IF ** condition only credit and debit is swapped on both queries, due to this **Credit and Debit** and this where clause "and code.code_name="transaction_1" I am duplicating the query. Can you please give some solution to avoid this duplication. I am using oracle 11g
select DAY as business_date,sum(amount) as AMOUNT, type_amnt as amount_type,test_code as code_seg
from
select table1_alias.date as DAY,code.code_numb as test_code,
CASE
WHEN qnty_item > 0 THEN 'credit'
ELSE 'debit'
END as type_amnt,
"25.55" as amount
from
code_table code,
table1 table1_alias
join table2 table2_alias on table1_alias.id = table2_alias.id
where
table1_alias.state="OK"
and table1_alias.type="R"
and code.code_type="Movie"
and code.code_name="transaction_1"
UNION ALL
select table1_alias.date as DAY,code.code_numb as test_code,
CASE
WHEN qnty_item > 0 THEN 'debit'
ELSE 'credit'
END as type_amnt,
"25.55" as amount
from
code_table code,
table1 table1_alias
join table2 table2_alias on table1_alias.id = table2_alias.id
where
table1_alias.state="OK"
and table1_alias.type="R"
and code.code_type="Movie"
and code.code_name="transaction_2"
group by DAY, test_code,type_amnt
ThanksA very brief glance and it looks to me like the only difference between the 2 queries are
and code.code_name="transaction_1"In the first portion and
and code.code_name="transaction_2"So if that's all that is difference, you'd just want to use a single query (no union's) with
and code.code_name in ('transaction_1', 'transaction_2')Cheers,

!! Getting error while using function in where clause

Hi,
I have created a function as below
create function find_cnt(n varchar2)
return number is
cnt number;
begin
execute immediate 'select count(1) from '||n into cnt;
return nvl(cnt,0);
end;
and when running the below select
select find_cnt(object_name),object_name from user_objects where object_type='TABLE' and find_cnt(object_name)=0
I getting
ERROR:
ORA-04044: procedure, function, package, or type is not allowed here
ORA-06512: at "SCOTT.FIND_CNT", line 5
can anyone help????????
thanks
Harish

In 11g you could simply do
SQL> select table_name, trim(column_value) cnt
from user_tables, xmltable(('count(ora:view("'||table_name||'"))'))
TABLE_NAME                     CNT
DEPT                           4
BONUS                          0
SALGRADE                       5
DEMO_USERS                     2
DEMO_CUSTOMERS                 7
DEMO_ORDERS                    10
DEMO_PRODUCT_INFO              10
DEMO_ORDER_ITEMS               16
DEMO_STATES                    51
DEMO_PAGE_HIERARCHY            18
TABLE1                         6
TABLE2                         6
CREATE$JAVA$LOB$TABLE          0
CLICKS                         1
T                              0
EMP                            14
PLAN_TABLE                     2
17 rows selected.

Can we use concatenate in where clause of a select query

I have a select query as follows....
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                             INTO TABLE i_ekbe
                             FOR ALL ENTRIES IN i_blck
                             WHERE ebeln = i_blck-ebeln AND ebelp =
i_blck-ebelp.
Now i want to retrieve data from BKPF ..can i write a select query something like....
select * from BKPF into itab
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            where awkey = ( conatenate i_ekbe-belnr i_ekbe-gjahr )
OR ELSE...is there any other way to link table ekbe and bseg ???

Hi Poonam,
SELECT ebeln ebelp belnr vgabe bwart DMBTR
FROM ekbe
INTO TABLE i_ekbe
FOR ALL ENTRIES IN i_blck
WHERE ebeln = i_blck-ebeln
AND ebelp = i_blck-ebelp.
select *
from BKPF
into table itab
FOR ALL ENTRIES IN i_ekbe
where belnr = i_ekbe-belnr.
If u want to check with AWKEY concatenate into seperate field and then use to check in where condition.
data: lw_awkey(20) type c.
CONCATENATE i_ekbe-belnr i_ekbe-gjahr INTO lw_awkey.
select *
from BKPF
into table itab
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Strange errors when using user defined function in where clause

Hello,
I am having trouble with a function that, when used in the where clause of a select will cause an error if the first column selected is of type INTEGER. Not sure whether I am doing something wrong or whether this is a bug.
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col1 integer not null,
col2 varchar(20) ascii default ''
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insert into test values(2,'2011-03-15 07:00:00')
CREATE FUNCTION BTR_TAG RETURNS VARCHAR AS
VAR ret VARCHAR(20);
SET ret='2011-03-15 06:00:00';
RETURN ret;
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Select col1,col2 from test where col2 >= BTR_TAG()
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Select '',* from test where col2 >= BTR_TAG()
Select col2,col1 from test where col2 >= BTR_TAG()
=> works as it should
MaxDB V 7.7.07.16 running on Windows Server 2003
I can replicated the test case above with Sql Studio and other ODBC based tools.
Thanks in advance,
Silke Arnswald

Hello Siva,
sorry, but I don't understand your reply:
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MaxDB 7.7.07.16 is the community version of MaxDb,
we are not using it for SAP
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Can you use boolean function in where clause

Hi,
I have a boolean function. Is it possible to use it in where clause of query.
Eg;
is_prime(13) returns boolean
select 1 from dual where is_prime(13)

What about something like this
Create or replace function boolret(id number) return boolean as
begin
If id <10 then
return true;
elsif id>10 and id<100 then
return false;
else
return null;
end if;
end;
1 declare
2 id_cat boolean;
3 begin
4 id_cat:= boolret(8);
5 dbms_output.put_line(id_cat);
6* end;
SQL> /
dbms_output.put_line(id_cat);
ERROR at line 5:
ORA-06550: line 5, column 2:
PLS-00306: wrong number or types of arguments in call to 'PUT_LINE'
ORA-06550: line 5, column 2:
PL/SQL: Statement ignored
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Raj deep.A

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Hi All,
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Hi,
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Pick one of the tables; fcr perhaps, and write a query that just uses that table, like this:
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FROM       apps.fnd_concurrent_requests     fcr
WHERE       fcr.actual_start_date          >= TRUNC (SYSDATE)
AND       fcr.actual_start_dt          < TRUNC (SYSDATE) + 1
;(I think this is what you meant to do when you said "... LIKE SYSDATE".)
Make sure this little query gets credible results. When that tiny query is working perfectly, add another line or two. You can cut and paste code from what you posted, if that helps you.
If you get stuck, post the last version of your code that worked perfectly, and the latest version (only a line or two bigger) that has the problem. Describe what the problem is. If you get an error, post the complete error message. In any event, post CREATE TABLE and INSERT statements for all the tables and columns needed to run the query, and the results you want to get from that query.
When you post any code, format it, so that how the code looks on the screen gives some clues about how it is working.
When you post any formatted text on this site, type these 6 characters:
\(small letters only, inside curly brackets) before and after each section of formatted text, to preserve spacing.
If you going to use the AVG function in the sub-query, then you probably need to do a GROUP BY in the sub-query.
If you're not using any aggregate functions (like AVG) in the main query, then you probably don't want to do a GROUP BY in the main query.
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How can we use DECODE function in where clause.

Hi Guys,
I have to use DECODE function in where clause.
like below
select * from tab1,tab2
where a.tab1 = b.tab2
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in this manner its not accepting?
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Thanks
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>
I am looking for to decode the actual db value something in different for my report.
like if A then Accepted
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these conditions I have to check in where clause.
>
what are you trying to do?
may be you are looking for
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The following two queries are identical except for how I supply the date values in the where clause, yet the first query using the a custom my_date function runs 30x slower than the one using the TO_DATE() function. Both return DATE types...any reason for the difference?
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AND start_time < fn_my_date('END_MONTH')+1
-- This runs 30x faster--
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WHERE start_time >=TO_DATE('08/01/2001','MM/DD/YYYY')
AND start_time < TO_DATE('08/31/2001','MM/DD/YYYY')+1
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null

I haven't seen the message coming up when using LENGTH or SUBSTR, but every time I connect to a database or attempt to change my preferences (including the "NLS Parameters: Comp" preference), this appears.
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Bad performance when calling a function in where clause

Hi All,
I have a performance problem when executing a query that contains a function call in my where clause.
I have a query with some joins and a where clause with some regular filters. But one of these filters is a function, and its input parameters are columns of the tables used in the query.
When I run it with only a few rows in the tables, it goes ok. But as the number of rows grows, performance falls geometrically, even when my where clause filters the result to only a few rows.
If I take the function call off of the where clause, then run the query and then call the function for each returned row, performance is ok. Even when the number of returned rows is big.
But I need the function call to be in the where clause, because I can't build a procedure to execute it.
Does anyone have any clue on how to improve performance?
Thanks,
Rafael

You have given very little information...
>
If I take the function call off of the where clause, then run the query and then call the function for each returned row, performance is ok. Even when the number of returned rows is big. Can you describe how you measured the performance for a big result set without the function? For example lets say there had been 10.000 rows returned (which is not really big, but it is astarting point). Did you see all 10.000 rows? A typical mistake is to execute the query in some tool like Oracle SQL Developer or TOAD and measure how fast the first couple of rows are returned. Not the performance of the full select.
As you can see from this little detail there are many questions that you need to address first before we can drill down to the root of your problem. Best way is to go through the thread that Centinul linked and provide all that information first. During the cause of that you might discover that you learn things on the way that help a lot for later tuning problems/approaches.
Edited by: Sven W. on Aug 17, 2009 5:16 PM

Can't have aggregate function in WHERE clause clause

Dear all,
I've created object in BO XI 3.1 Designer with following criterias:
http://img4.imageshack.us/img4/833/20111201124314.th.jpg
It is a simple number - 1,2,3,4,5.
Now I need to use this object as a criteria for WHERE function in another object.
http://img607.imageshack.us/img607/1543/20111201124717.th.jpg
I receive an error "Can't have aggregate function in WHERE clause <clause>"
How can I overcome this?
P.S. I'm sorry in advance if such topic already exist - I didn't found one.
Edited by: Ashot Antonyan on Dec 1, 2011 9:50 AM
Edited by: Ashot Antonyan on Dec 1, 2011 9:51 AM

Hi,
You will have to use Sub query to achieve this. Give more details on what is available and what you need then i could help you out with the complete solution.
Thanks,
Ravichandra K

Clarification on using function in where clause of oracle sql query

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