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Answers and rating deltas for

Why do I need to use "as" keyword in this sql query?

Author Votes Δ
Gordon Linoff 5 +1.20
Serg 3 +1.01
trincot 2 -0.51
Iain 1 -0.40
xQbert 0 -1.10
kjmerf 0 -2.63
Last visited: Nov 27, 2016, 6:25:03 PM