sql语句：将一个表中的字段a的值赋给字段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

这儿将slct表中字段daiM的值赋给了字段daiM2，最后的id<10是条件，只修改id小于10的那几行

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