sql語句：將一個表中的字段a的值賦給字段b

原創 雨沫流沙 2020-04-06 11:36

update a set a.daiM2=b.daiM from slct a,slct b where a.id=b.id and id<10

這兒將slct表中字段daiM的值賦給了字段daiM2，最後的id<10是條件，只修改id小於10的那幾行

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