sql - Is IN with the multiple of the same terms slower? -


for example, noticeably slower:

delete [table] [reoid] in ( 1, 1, 1, 2, 2, 1, 3, 5)

than this:

delete [table] [reoid] in ( 1, 2, 3, 4)

sql server 2008 r2.

thanks!

most engines eliminate duplicates in constant in list on parsing stage.

such query parse marginally slower non-duplicated list, produce same plan , real-world scenarios, hardly notice difference.


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