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Answers and rating deltas for

Why can "WHERE col LIKE 'a%'" use an index, but not "WHERE col LIKE '%a%'"?

Author Votes Δ
Mark Amery 5 +4.70
Kermit 3 +0.77
Ike Walker 2 -0.98
Last visited: Sep 14, 2014, 5:07:29 AM