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
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