用MYSQL替换时间字段且时分秒不变的方法-木庄网络博客

本文摘自PHP中文网，作者巴扎黑，侵删。

1	`写法1：update sas_order_supply_month_pay set RECEIVE_TIME=REPLACE(RECEIVE_TIME,DATE_FORMAT(RECEIVE_TIME,'%Y-%m-%d'),(select PERIOD_END from sas_task_supply_month_pay_period where belong='1729'` `and` `CREATE_TIME like` `'%2017-07-12%')) where ORDER_CODE='PO201707130115';`

1	`写法2：update sas_order_supply_month_pay set RECEIVE_TIME= ADDTIME ((select PERIOD_END from sas_task_supply_month_pay_period where belong='1729'` `and` `CREATE_TIME like` `'%2017-07-12%')+interval 0 hour,time(RECEIVE_TIME)) where ORDER_CODE='PO201707130115';`

1	`写法3：update sas_order_supply_month_pay set RECEIVE_TIME = concat((select PERIOD_END from sas_task_supply_month_pay_period where belong='1729'` `and` `CREATE_TIME like` `'%2017-07-12%'),' ',DATE_FORMAT(RECEIVE_TIME,'%H:%i:%S')) where ORDER_CODE='PO201707130115';`

说明： sas_order_supply_month_pay表的RECEIVE_TIME字段格式为"2017-06-16 12:13:16"，sas_task_supply_month_pay_period表的PERIOD_END字段格式为"2017-07-12",

执行后RECEIVE_TIME修改为"2017-07-12 12:13:16"。

错误写法：update sas_order_supply_month_pay set RECEIVE_TIME = DATE_FORMAT(concat((select PERIOD_END from sas_task_supply_month_pay_period where belong='1729' and CREATE_TIME like '%2017-07-12%'),' ',(select DATE_FORMAT(RECEIVE_TIME,'%H:%i:%S') from sas_order_supply_month_pay

where ORDER_CODE='PO201707130115')),"yyyy-MM-dd %H:%i:%S") where ORDER_CODE='PO201707130115';

错误写法报错：[Err] 1093 - You can't specify target table 'sas_order_supply_month_pay' for update in FROM clause

错误分析：

错误语句：(select DATE_FORMAT(RECEIVE_TIME,'%H:%i:%S') from sas_order_supply_month_pay where ORDER_CODE='PO201707130115')

此语句单独执行是可以的，但是合在一起执行报错，猜测：修改表和子查询不能是同一个表？

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