1、常用
语法结构：update 表名 set 列名1=值1,列名2=值2,列名3=值3..... where 条件
update student t
set t.age = ‘24‘, t.idnumber = ‘3503021994XXXXXXXX‘ where t.stuname = ‘张三‘; update 表1 set 列名=（select 列名 from 表2 where 表1.列名=表2.列名）
where exists (select 1 from 表2 where 表1.列名=表2.列名)update student.stuinfo t
set (age, idnumber) = (select age, idnumber from student.stuinfo_2018 b where b.stuid = t.stuid) where exists (select 1 from student.stuinfo_2018 b where b.stuid = t.stuid and b.stuname = ‘张三‘);update 表名 set ... where exiists ...
原文：https://www.cnblogs.com/diandixingyun/p/12979177.html