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Answers and rating deltas for

What is wrong with this simple sql query? it returns 0 rows

Author Votes Δ
Navjot Singh 3 +4.37
Gordon Linoff 2 +0.36
Ali Sheikhpour 2 +2.24
Clon 2 +2.21
BabyDuck 1 -0.30
Pரதீப் 0 -0.65
Zio Panzu 0 -2.69
Smutje 0 -0.37
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