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1.需求：修改评论表中的昵称为手机号码最后4位。
UPDATE trans_eval SET issuer_name = MID(issuer_name,4,6) WHERE CHAR_LENGTH(issuer_name) = 11 AND issuer_name LIKE ‘1%‘;
2.由于误操作(MID(issuer_name,4,6)是中间的6位)，需要数据回滚。
3.建立中间表(AND 1<>1 条件不符合建立空表)
CREATE TABLE tmp SELECT T2.REG_NO,T2.MOBILE,t1.`issuer_name` FROM trans_eval t1,member t2 WHERE t1.issuer_no =t2.`reg_no` AND MID(t2.`mobile`,4,6) =t1.`issuer_name` AND 1<>1 GROUP BY T2.REG_NO,T2.MOBILE,t1.`issuer_name` ;
4.导入数据到中间表
INSERT INTO tmp SELECT T2.REG_NO,T2.MOBILE,t1.`issuer_name` FROM trans_eval t1,member t2 WHERE t1.issuer_no =t2.`reg_no` AND MID(t2.`mobile`,4,6) =t1.`issuer_name` GROUP BY T2.REG_NO,T2.MOBILE,t1.`issuer_name` ;
5.数据恢复
SELECT * FROM tmp; UPDATE tmp t1,trans_eval t2 SET t2.`issuer_name`=t1.`MOBILE` WHERE t1.`REG_NO`=t2.`issuer_no`;
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原文地址：http://www.cnblogs.com/simpledev/p/4221957.html
