MYSQL替换时间(年月日)字段时分秒不变实例解析
时间：2021-09-24 10:58:24|栏目：Mysql|点击： 次
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';
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';
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： s
as_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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