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Answers and rating deltas for

How can I compare two tables in PHP and display not matched software name from table 1?

Author Votes Δ
Tatha 1 +4.05
Mangal 0 -1.29
Mangal 0 -1.29
Saqueib 0 -0.18
Last visited: Nov 13, 2015, 6:02:14 AM