update left join

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update c set READ_FLAG = 'N' from COM_USER_CONSULT c left join COM_SYSTEM_USER u on u.ROW_ID = c.USER_ID
left join APP_M_FANS m on m.FANS_ID = c.USER_ID where m.MID = 'DD6CEC6375B245CDAE3C2A5650AFEB05'
and c.CONSULT_STATUS = 'NEW' and u.DELETE_FLAG = 'N' and C.DELETE_FLAG='N' and m.DELETE_FLAG ='N'


update 可以在SET后面添加from,然后在left join需要的表。

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