总和（情况......结束）分组

Question

select sum(case when(remark='Regular') then count(*)
               when(remark='Half Day') then count(*)* 0.5
           end),
       shift
from attendance
where empid='1447' and mont='02' and payyear='2015'
group by shift, remark
order by shift

如何在SQL Server中编写？

Answer 1

将案例放在聚合函数中：

select sum(case when remark = 'Regular' then 1
                when remark = 'Half Day' then 0.5
           end),
       shift
from attendance
where empid='1447' and mont='02' and payyear='2015'
group by shift
order by shift

另外，从remark删除group by。