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螳 isnull()襯 .
select isnull(colA, colB) colA from test

襷曙
  • colA varchar(1)
  • colB varchar(10)
企

貎朱Μ colA螳 null 蟆曙 colB varchar(1)朱 讌るΠ.
鏤
蠍 蠍郁鍵..
企: : るジ讓曙 襦螻豺 企Ν 譯殊語. 襦螻豺
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覲旧 豺 豌讌 企 殊 蟆. 讌 企 蟆. 讌 企 殊 襷 螳讌 蟆企. (豺誤)