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Answers and rating deltas for

What is the solution to 13th part of 'select from world' tutorial on sqlzoo?

Author Votes Δ
markus 8 +4.05
clesiemo3 3 -0.09
stackOFjw 1 -3.96
Romanchelli 0 0.00
Last visited: Nov 12, 2015, 10:40:02 PM