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optimize sql statement

Posted on 2011-03-15
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Last Modified: 2012-05-11
Hello,

How can I optimize this statement which takes time :

select *   ,
(
select name
from [server].base.sys.schemas
where name = 'TESTS' and rowid not in (select ZROWID_0 from  ods.schema.table where [ZDOS_0] = 'TEST')

) as [ZDOS_0] into #stmt_repl
from [server].base.schema.table

Thanks

bibi
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Question by:bibi92
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5 Comments
 
LVL 11

Expert Comment

by:JoeNuvo
ID: 35143761
How many rows return from each table?

SELECT COUNT(*) FROM [server].base.sys.schemas WHERE name = 'TESTS'
SELECT COUNT(*) FROM ods.schema.table WHERE [ZDOS_0] = 'TEST'

Since I'm wonder why it will take some significant process time.
0
 

Author Comment

by:bibi92
ID: 35152330
7332245rows and 2345673rows
Thanks
Regards
bibi
0
 
LVL 11

Expert Comment

by:JoeNuvo
ID: 35153397
Not sure if this will help

DECLARE @name sysname -- change datatype if need to
SELECT @name = name FROM [server].base.sys.schemas WHERE name = 'TESTS'

SELECT *, @name as [ZDOS_0]
INTO #stmt_repl
FROM [server].base.schema.table

UPDATE #stmt_repl
SET x = NULL
FROM ods.schema.table OST
WHERE #stmt_repl.rowid = OST.ZROWID_0 -- if field name is not rowid, change it to the correct one
AND OST.ro = 'TEST'

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Accepted Solution

by:
JoeNuvo earned 2000 total points
ID: 35153403
oops, some mistake

please change SET x = NULL

to SET [ZDOS_0] = NULL
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Author Closing Comment

by:bibi92
ID: 35304727
Thanks bibi
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