10774 - LIKE '% R' is used instead of LIKE '% R%',

Hi experts,

can you give me an example in TSQL for this:
performs better when LIKE '% R' is used instead of LIKE '% R%', and
that the first way is possible that the engine makes use of an index that could
be created to sort the information by the letter R.
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ste5anSenior DeveloperCommented:
Nope. LIKE '%pattern' is a non-sargeable predicate. It cannot use an index at all. Also '%pattern%' is non-sargable. So no index is used for both predicates.
enrique_aeoAuthor Commented:
please, can you give me an example in TSQL code
ste5anSenior DeveloperCommented:
Believe, Scully!

In the first case the index is used properly, thus a seek. In the second case it's using this index only because its covering, so reads are reduced in comparision by using the clustered index, but it's a scan. So the predicate it's not used.

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Microsoft SQL Server

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