寫法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';
寫法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';
寫法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';
說明： sas_order_supply_month_pay表的receive_time字段格式為”2017-06-16 12:13:16″，sas_task_supply_month_pay_period表的period_end字段格式為”2017-07-12″,
執行后RECEIVE_TIME修改為“2017-07-12 12:13:16“。
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錯誤寫法：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';
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錯誤寫法報錯：[Err] 1093 – You can’t specify target table ‘sas_order_supply_month_pay’ for update in FROM clause
錯誤分析：
錯誤語句：(select DATE_FORMAT(RECEIVE_TIME,‘%H:%i:%S‘) from sas_order_supply_month_pay where ORDER_CODE=‘PO201707130115‘)
此語句單獨執行是可以的，但是合在一起執行報錯，猜測：修改表和子查詢不能是同一個表？
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