MYSQL替换时间(年月日)字段时分秒不变实例解析

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？

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