编程学习资讯网

MYSQL替换时间(年月日)字段,时分秒不变--编程学习网

发布时间:2017-07-17 09:05:08   来源:本站编辑   浏览次数:
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: 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?

编程学习网 http://www.javalearns.cn

关注微信号:javalearns   随时随地学Java

或扫一扫

随时随地学Java