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 Transact-SQL (2005)
 dynamic where clause and null values
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DonAtWork
Flowing Fount of Yak Knowledge

2167 Posts

Posted - 04/17/2007 :  11:24:51  Show Profile  Reply with Quote
I bet
DROP DB 'HISDBHERE'
fixes it!

[Signature]For fast help, follow this link:
http://weblogs.sqlteam.com/brettk/archive/2005/05/25.aspx
Learn SQL
http://www.sql-tutorial.net/
http://www.firstsql.com/tutor.htm
http://www.w3schools.com/sql/default.asp
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tkizer
Almighty SQL Goddess

USA
38200 Posts

Posted - 04/17/2007 :  11:46:04  Show Profile  Visit tkizer's Homepage  Reply with Quote
quote:
Originally posted by jsmith8858

quote:
Originally posted by tkizer

quote:
Originally posted by dinakar

Theoretically it should be better since using functions on column names especially in WHERE clauses can force table scans..




I don't believe that's the case in his situation since the column is isolated on one side of the predicate:

WHERE ColumnName = SomeFunction(...)

Perhaps this is what you are referring to:

WHERE SomeFunction(ColumnName, ...) = SomeValue

Tara Kizer
http://weblogs.sqlteam.com/tarad/



Actually, that is not correct, the column is not isolated on one side ...
The column is referenced on BOTH sides.

This is actually the situation:

WHERE ColumnName = SomeFunction(... ColumnName ... )


- Jeff
http://weblogs.sqlteam.com/JeffS




But the point I was trying to make is about the table scan.

Tara Kizer
http://weblogs.sqlteam.com/tarad/
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jsmith8858
Dr. Cross Join

USA
7423 Posts

Posted - 04/17/2007 :  12:14:42  Show Profile  Visit jsmith8858's Homepage  Reply with Quote
Tara -- I was simply responding to your statement about the column being isolated on one side; yes, on one side it is indeed isolated, but it is also referenced AGAIN on the other side (in the COALESCE() function) ... therefore, it will incur a scan.





- Jeff
http://weblogs.sqlteam.com/JeffS
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