• MYSQL替换时间(年月日)字段,时分秒不变


    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?

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  • 原文地址:https://www.cnblogs.com/againn/p/7168987.html
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