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SARGable


SARGable

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agrawal.prakriti
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Comments posted to this topic are about the item SARGable
WayneS
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The "correct" answer doesn't have a column in the where clause... how can that be SARGable?

Wayne
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WayneS (2/25/2010)
The "correct" answer doesn't have a column in the where clause... how can that be SARGable?


I would have to agree here. The lack of a column in the where clause makes none of the answers correct.



Jason AKA CirqueDeSQLeil
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WayneS (2/25/2010)
The "correct" answer doesn't have a column in the where clause... how can that be SARGable?


Agreed. If the query is not RUNable then it can't be SARGable. :-D
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Agreed. ..The Answers was not properly printed wrong

A condition (or predicate) in a query is said to be sargable if the DBMS engine can take advantage of an index to speed up the execution of the query (using index seeks, not covering indexes). The term is derived from a contraction of Search Argument.
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Hmmm. Either assume the pseudo code has a typo and choose the "right" answer, or take the question literally and choose the "wrong" answer. A 50/50 chance. I'm gonna have to start using dice to answer the QotD. :-)

S.
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Yeah, I agree with CirquedeSQLeil, The lack of a column in the where clause makes none of the answers correct
SandyDB
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Non-sargable search arguments in the WHERE clause, such as "IS NULL", "<>", "!=", "!>", "!<", "NOT", "NOT EXISTS", "NOT IN", "NOT LIKE", and "LIKE '%500'" generally prevents (but not always) the query optimizer from using an index to perform a search.

How can where clause without column name can be SARGable while index can not be performed on this?

Please correct me in case I am wrong.
Kingston Dhasian
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I noticed it only now. The first option has a column in the Where Clause. It must be a typo for sure. Anyways i got it right:-)


Kingston Dhasian

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SandyDB (2/26/2010)
Non-sargable search arguments in the WHERE clause, such as "IS NULL", "<>", "!=", "!>", "!<", "NOT", "NOT EXISTS", "NOT IN", "NOT LIKE", and "LIKE '%500'" generally prevents (but not always) the query optimizer from using an index to perform a search.

How can where clause without column name can be SARGable while index can not be performed on this?

Please correct me in case I am wrong.


The content of your reply looks remarkably like paragraph 2 of www.sql-server-performance.com/tips/t_sql_where_p2.aspx) .. so I'm not gonna argue with Brad MacGehee ;-)
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