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SQL: Why does Max() from multiple tables return NULL for everything if one table is empty?

Author Votes Δ
Philipp 3 +4.49
spencer7593 1 +0.46
ypercubeᵀᴹ 1 +0.19
Prasanth Bendra 0 -1.21
Last visited: Sep 14, 2014, 5:07:29 AM