在 MYSQL 里能否一步完成同表同字段的 update 更新呢？

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This topic created in 4178 days ago, the information mentioned may be changed or developed.

tab1
id name telphone address
1 a1 a2 a3
2 b1 b2 b3

在MYSQL里想用id=2的name(b1) 去更新替换id=1的name(a1)

以前的流程分两步
先查出值id=2的$name = tab2.name
然后更新updata tab1 set name=$name where id = 1

上面这个两步能否合并成一步（一条SQL）完成呢？

4 replies • 2015-04-20 17:35:41 +08:00

xiao303178394

Apr 20, 2015

update tab1 t,tab1 t2 set t.name = t2.name where t.id = 1 and t2.id =2;
commit;

Septembers

Apr 20, 2015

jookr

Apr 20, 2015

@xiao303178394 灰常感谢

jookr

Apr 20, 2015