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[Mysql数据库] MYSQL替换时间(年月日)字段时分秒不变实例解析

发表于 2017-10-9 08:00:02
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写法1:

  1. update sas_order_supply_month_pay set
  2. 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'
  3. and CREATE_TIME like '%2017-07-12%')) where ORDER_CODE='PO201707130115';
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写法2:

  1. update sas_order_supply_month_pay set
  2. RECEIVE_TIME= ADDTIME ((select PERIOD_END from sas_task_supply_month_pay_period where belong='1729'
  3. and CREATE_TIME like '%2017-07-12%')+interval 0 hour,time(RECEIVE_TIME)) where ORDER_CODE='PO201707130115';
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写法3:

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

  1. 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",
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执行后RECEIVE_TIME修改为"2017-07-12 12:13:16"。

错误写法:

  1. update sas_order_supply_month_pay set
  2. RECEIVE_TIME = DATE_FORMAT(concat((select PERIOD_END from sas_task_supply_month_pay_period where belong='1729'
  3. and CREATE_TIME like '%2017-07-12%'),' ',(select DATE_FORMAT(RECEIVE_TIME,'%H:%i:%S') from sas_order_supply_month_pay
  4. where ORDER_CODE='PO201707130115')),"yyyy-MM-dd %H:%i:%S") where ORDER_CODE='PO201707130115';
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错误写法报错:

  1. [Err] 1093 - You can't specify target table 'sas_order_supply_month_pay' for update in FROM clause
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错误分析:

错误语句:

  1. (select DATE_FORMAT(RECEIVE_TIME,'%H:%i:%S') from sas_order_supply_month_pay where ORDER_CODE='PO201707130115')
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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?

以上所述是小编给大家介绍的MYSQL替换时间(年月日)字段时分秒不变的实现方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对程序员之家网站的支持!



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