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螳 isnull()襯 .
select isnull(colA, colB) colA from test 襷曙
貎朱Μ colA螳 null 蟆曙 colB varchar(1)朱 讌るΠ.
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瑚 覃企 覲 譴 蟆 譴 蟆 蠍企. (蟾) |