case when 自定义排序时的使用
根据 case when 新的 sort字段排序
case
when t2.status = 4
and t2.expire_time>UNIX_TIMESTAMP()
and t2.expire_time<UNIX_TIMESTAMP(DATE_ADD(NOW(),INTERVAL 60 day)) then 4 when `status` = 2 then 3 when `status` = 3 then 2 when t2.status = 4 and t2.expire_time>UNIX_TIMESTAMP(DATE_ADD(NOW(),INTERVAL 60 day)) and t2.expire_time<UNIX_TIMESTAMP(DATE_ADD(NOW(),INTERVAL 1 year)) then 1 else 0 end sort $query->orderBy('sort desc ,t2.expire_time desc,t2.created_at desc');
- 当colume 与condition 条件相等时结果为result
case colume
when condition then result
when condition then result when condition then result else result end
- 当满足某一条件时,执行某一result
case
when condition then result
when condition then result when condition then result else result end
- 当满足某一条件时,执行某一result,把该结果赋值到new_column_name 字段中
case
when condition then result
when condition then result when condition then result else result end new_column_name
case when 用在select 语句中,新的字段new_column_name可以用来排序,但是不能用在where中