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MS SQL: How union works inside if exists condition?

Author Votes Δ
Gordon Linoff 3 +0.39
user2877959 1 +0.20
Shyam Vemula 1 +0.30
Mr Slim 1 +0.13
Madhukar 0 -3.72
Last visited: Nov 22, 2017, 12:38:45 PM