Force Query To Return 0 not null
This is my syntax and it does not return any results, which is accurate, but how can I set it to return a '0' instead of a blank result set? I REALLY need this to take place within a query and not a stored procedure, if at all possible...
Select count(a.empID) As employeeID, b.employeePhone, 'Employee Info' As data
FROM tableMaster b Inner Join tableBadSetup a
ON a.empID = b.empID
Where b.empStatus = 'Leave'
Group By b.employeePhone
select
isnull(employeeID,0) as employeeID,
employeePhone,
data
from
Select count(a.empID) As employeeID, b.employeePhone, 'Employee Info' As data
FROM tableMaster b Inner Join tableBadSetup a
ON a.empID = b.empID
Where b.empStatus = 'Leave'
Group By b.employeePhone
) tt
This shud help..
Thanks,
Jay
<If the post was helpful mark as 'Helpful' and if the post answered your query, mark as 'Answered'>
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Edited by: BluShadow on 12-Jul-2012 16:12
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is
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loop
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then
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Wrote file afiedt.buf
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SQL> /
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14
15
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17
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Request your help in understanding the below scenario. (I am not aware of teh application and table details. Just trying to help my friend)
SQL> conn
Enter user-name: [email protected]
Enter password:
Connected.
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi
PL/SQL Release 10.2.0.3.0 - Production
CORE 10.2.0.3.0 Production
TNS for Linux: Version 10.2.0.3.0 - Production
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COUNT(*)
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C
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hi All,
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FROM rCTE
Don't forget to mark helpful posts, and answers. It helps others to find relevant posts to the same question. -
Hi,
there are many queries my one of my packages, which has the SQL as follows:
Update table XYZ
Set Column A = NULL
Where Colum B IS NOT NULL;
Column B has NUMBER datatype.
Due to 'IS NOT NULL' the index (existing for Column B' is not being used in the above query, leading to Full table scan. Is there any ways of forcing teh index to be picked/used by the query?
Thanks,
Rosalinthansk again for response. Checked the % of the data
fetched by this query and it ranges from 20% to 50
%(varies due to teh fact the table data content could
have different set of data depending on the days
transactions done). So for sure index usage would
help.
Additionally this sql(used in multiple places) come
up in the v$longsops output.
so definitely needs tuning.
Any suggestions?That's not really true though if you understand the mechanisms employed for a full table scan vs an index scan / table lookup (by rowid since the table must also be visited).
Here's something good for you to read
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:4433887271030
A full tablescan reads the table using large sequential reads -- many blocks at a time.
Sequential reads are the fastest type of IO you can do on a disk in general.
An index read will do single block, random IO's. These are generally the slowest you can
do.
I would suggest to you that if you have statistics on the table/indexes that are representative of the data, the Optimizer will be smarter than you (most cases, not all).
Message was edited by:
Tubby -
Oracle 11g:Query to return only 1 to 1 relationship & random selection
Hi
I have a complex query to modify but I have below the sample tables and data with only very few fields(only affected fields).
Query based on 2 tables b_test and s_test.
Pls see below.
create table b_test(building_id number not null,invalid varchar2(1));
create table s_test(sub_building_id number not null,building_id number ,invalid varchar2(1),sequence_no number);
insert into b_test values (1000,'N');
insert into b_test values(2000,'N');
insert into b_test values(3000,'N');
commit;
insert into s_test values(1,1000,'N',90);
insert into s_test values(2,1000,'N',91);
insert into s_test values(3,1000,'N',92);
insert into s_test values(4,1000,'Y',93);
insert into s_test values(5,NULL,'N',NULL);
insert into s_test values(1,2000,'N',94);
insert into s_test values(2,2000,'N',95);
insert into s_test values(3,2000,'N',96);
insert into s_test values(4,2000,'N',97);
insert into s_test values(5,2000,'N',98);
insert into s_test values(6,NULL,'N',NULL);
insert into s_test values(10,3000,'N',99);
insert into s_test values(11,3000,'N',100);
commit;The query below returns all rows required:(also see results:)
select b.building_id,b.invalid,s.sub_building_id,s.sequence_no from b_test b,
(select * from s_test where invalid='N') s
where b.building_id = s.building_id(+)
and b.invalid='N'
Results:
BUILDING_ID INVALID SUB_BUILDING_ID SEQUENCE_NO
1000 N 1 90
1000 N 2 91
1000 N 3 92
2000 N 1 94
2000 N 2 95
2000 N 3 96
2000 N 4 97
2000 N 5 98
3000 N 10 99
3000 N 11 100Now there are 2 requirements:
1)How can the above query be changed so that 1:1 relationship if sub_building_id is returned?i.e For 1 building_id, only show 1 sub_building(This could be a random selection)
(Pls help with query)
The results would be like
BUILDING_ID INVALID SUB_BUILDING_ID SEQUENCE_NO
1000 N 1 90
2000 N 1 94
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The results will be:
BUILDING_ID INVALID SUB_BUILDING_ID SEQUENCE_NO
1000 N 1 90
1000 N 2 90
1000 N 3 90
2000 N 1 94
2000 N 2 94
2000 N 3 94
2000 N 4 94
2000 N 5 94
3000 N 10 99
3000 N 11 99Many thanks!
Edited by: Krithi on 08-Nov-2012 08:48
Edited by: Krithi on 08-Nov-2012 08:55Krithi wrote:
Hi
I have a complex query to modify but I have below the sample tables and data with only very few fields(only affected fields).
Query based on 2 tables b_test and s_test.
Pls see below.
create table b_test(building_id number not null,invalid varchar2(1));
Thanks for posting the CREATE TABLE and INSERT statements, and your existing query; that's very helpful.
The query below returns all rows required:(also see results:)
select b.building_id,b.invalid,s.sub_building_id,s.sequence_no from b_test b,
(select * from s_test where invalid='N') s
where b.building_id = s.building_id(+)
and b.invalid='N'
Results:
BUILDING_ID INVALID SUB_BUILDING_ID SEQUENCE_NO
1000 N 1 90
1000 N 2 91
1000 N 3 92
2000 N 1 94
2000 N 2 95
2000 N 3 96
2000 N 4 97
2000 N 5 98
3000 N 10 99
3000 N 11 100
When I run your query, I get NULL for sequence_no on the last 2 rows, where building_id=3000. The numbers 99 and 100 don't seem to occur in either table. Did you post the worng sample data and/or results?
>
Now there are 2 requirements:
1)How can the above query be changed so that 1:1 relationship if sub_building_id is returned?i.e For 1 building_id, only show 1 sub_building(This could be a random selection)
(Pls help with query) Here's one way:
WITH got_r_num AS
SELECT sub_building_id
, building_id
, sequence_no
, ROW_NUMBER () OVER ( PARTITION BY building_id
ORDER BY sequence_no
) AS r_num
FROM s_test
WHERE invalid = 'N'
SELECT b.building_id
, b.invalid
, r.sub_building_id
, r.sequence_no
FROM b_test b
LEFT OUTER JOIN got_r_num r ON r.building_id = b.building_id
WHERE NVL ( r.r_num
, 1
) = 1
ORDER BY b.building_id
;This is called a Top-N Query , because we're picking N items (N = 1 in this case) from the top of an ordered list. What makes one item the "top", and another one "lower"? That's determined by the analytic ORDER BY clause, in this case
ORDER BY sequence_noThat means the row with the lowest sequence_no (for each building_id) will get r_num=1. If you want a random row from that building_id to be chosen as #1, then you can change the analytic ORDER BY clause to
ORDER BY dbms_random.valueYou can ORDER BY anything you like, even a constant, but you must have an analytic ORDER BY clause. ROW_NUMBER requires an analytic ORDER BY clause.
The results would be like
BUILDING_ID INVALID SUB_BUILDING_ID SEQUENCE_NO
1000 N 1 90
2000 N 1 94
3000 N 11 100
Again, I don't see where the 100 comes from. The results I get are:
BUILDING_ID I SUB_BUILDING_ID SEQUENCE_NO
1000 N 1 90
2000 N 1 94
3000 N 11
2)How can the same SEQUENCE_NO be shown for all sub_buildings for the same building? (Pls help with query)
SELECT b.building_id
, b.invalid
, s.sub_building_id
, MIN (s.sequence_no) OVER ( PARTITION BY s.building_id)
AS seq_no
FROM b_test b
LEFT OUTER JOIN s_test s ON s.building_id = b.building_id
AND s.invalid = 'N'
The results will be:
BUILDING_ID INVALID SUB_BUILDING_ID SEQUENCE_NO
1000 N 1 90
1000 N 2 90
1000 N 3 90
2000 N 1 94
2000 N 2 94
2000 N 3 94
2000 N 4 94
2000 N 5 94
3000 N 10 99
3000 N 11 99
Again, I don't see where you get sequence_no = 99. The results I get are:
BUILDING_ID I SUB_BUILDING_ID SEQ_NO
1000 N 1 90
1000 N 2 90
1000 N 3 90
2000 N 1 94
2000 N 2 94
2000 N 5 94
2000 N 3 94
2000 N 4 94
3000 N 10
3000 N 11Edited by: Frank Kulash on Nov 8, 2012 12:12 PM
Added explanation and results
Edited by: Frank Kulash on Nov 8, 2012 12:28 PM
It looks like you cahnged your sample data from
insert into s_test values(10,3000,'N',NULL);
insert into s_test values(11,3000,'N',NULL);to
insert into s_test values(10,3000,'N',99);
insert into s_test values(11,3000,'N',100);The queries I posted are niow getting 99, like you requested.
Maybe you are looking for
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