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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.
鏤
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蟇 蟆 . 覈襯 蟇 譟郁 蟆企. 蠍磯ゼ 蟇 覈 蟆企. |