mysql同時修改2個表思路

標籤：

1.需求：修改評論表中的暱稱為手機號碼最後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.由於誤操作(MID(issuer_name,4,6)是中間的6位)，需要資料復原。

3.建立中間表(AND 1<>1 條件不符合建立空表)

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.匯入資料到中間表

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.資料恢複

SELECT * FROM tmp;UPDATE tmp t1,trans_eval t2 SET t2.`issuer_name`=t1.`MOBILE` WHERE t1.`REG_NO`=t2.`issuer_no`;

 

mysql同時修改2個表思路