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Answers and rating deltas for

How can I get the MAX value of a column from a record or 0 if no record is matched in my SELECT?

Author Votes Δ
Mikael Eriksson 2 +0.41
Pupa Rebbe 2 +3.32
Anon 1 -0.41
A_Sk 0 -3.30
Last visited: May 1, 2015, 8:04:45 PM