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Answers and rating deltas for

I want to alter table in php , but my code is not working

Author Votes Δ
Pupil 1 +0.38
Lalit Sharma 1 +2.63
Partha Mitra 0 -2.80
Faruk Omar 0 -2.85
Last visited: Apr 28, 2015, 11:18:43 AM