sql select语句选择sum在哪里

Question

我有两个临时表（下面），第一个表示五个条件之一。第二个从该表中拉出并根据条件进行求和和计数。我怎么能让第二个表格使用这个或类似的格式？

select ID
     ,sum_value    
     ,condition_field
     ,'condition_1' = case when condition_type in (1,2) then 1 else 0 end
     ,'condition_2' = case when condition_type in (3,4) then 1 else 0 end
     --etc...
into #temp    
from my_table

select ID
     ,sum_value
     ,'1_amt' = SUM(sum_value) from #temp where condition_1 = 1
     ,'1_cnt' = COUNT(ID) from #temp where condition_1 = 1
     ,'2_amt' = SUM(sum_value) from #temp where condition_2 = 1
     ,'2_cnt' = COUNT(ID) form #temp where condition_2 = 2
from #temp

Answer 1

你想要更像这样的东西：

SUM(CASE WHEN condition_1=1 THEN sum_value ELSE 0 END) AS 1_amt