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Answers and rating deltas for

How database system comes to know how many different values a particular column has?

Author Votes Δ
Gordon Linoff 3 +0.68
Wernfried Domscheit 1 +1.95
Sam D 0 -2.56
Jon Heller 0 -0.61
Last visited: Sep 14, 2014, 5:07:29 AM