mysql下sql语句 update 字段=字段+字符串 拼接

mysql下sql语句 update 字段=字段+字符串
mysql下sql语句令某字段值等于原值加上一个字符串



update 表明 SET 字段= 'feifei' || 字段; (postgreSQL 用 || 来连贯字符串)

　　MySQL连贯字符串不能利用加号(+)，而利用concat。

　　比方在aa表的name字段前加字符'x'，利用：

　　update aa set name=concat('x',name)



YEARWEEK(date_format(FOrderDate,'%Y-%m-%d'),1) = YEARWEEK(now(),1)  本周

date_format(Date,'%Y-%m-%d') 日期

TO_DAYS(NOW())

select count(FId) from TcOrder where date_format(FOrderDate,'%Y-%m')=date_format(now(),'%Y-%m')   本月

select count(FId) from TcOrder where YEARWEEK(date_format(FOrderDate,'%Y-%m-%d'),1) = YEARWEEK(now(),1)  本周


select count(FId) from TcOrder  where TO_DAYS(NOW()) - TO_DAYS(FOrderDate)=1 昨日

select count(FId) from TcOrder  where TO_DAYS(NOW()) = TO_DAYS(FOrderDate) 今日


select count(FId) as f,sum(FReceivableAmount) as r from TcOrder where  (FStatus='Payed' or FStatus='Finished') "+role +" and FPayDate   BETWEEN ? AND ?";//7日内金额