update修改的问题
请教下各位

A 表 B 表

a b c d e f
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1 2 3 1 2 5
2 3 4 2 3 7
3 a b 3 a m
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. . . . . . 写一个update 语句，当a表的a.a=b.d and a.b=b.e时更改a.c=b.f

------解决方案--------------------

SQL code

update t1 set c=t2.f from a t1 inner join b t2 on t1.a=t2.d and t1.b=t2.e

------解决方案--------------------
SQL code
update a
set a.c=b.f
from b
where a.a=b.d and a.b=b.e

------解决方案--------------------
SQL code
update a set c=b.f from a,b where a.a=b.d and a.b=b.e

------解决方案--------------------
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