子查詢在SQL

Question

聚合需要我有一個表是這樣的：

Id Date  Price Item Type 
1 2009-09-21 25  1  M 
2 2009-08-31 16  2  T 
1 2009-09-23 21  1  M 
2 2009-09-03 12  3  T 

我嘗試接收ID和的總和價格MULT物品列的輸出用於type =「M」，並用相同的邏輯的另一列用於type =「T」

只有這樣，如何做到這一點對我來說是使用多CTE但它是一種複雜的和大：

with cte as (
select distinct a.id, a.date 
sum(price*a.item) as numm 
from table a 
where a.type='M' 
group by a.id), 

crx as (
select cte.id, cte.numm, sum(a.price*a.item) as numm_1 from cte 
join table a on a.id=cte.id and a.date=cte.date 
where a.type='T' 
group by cte.id) 

select * from crx 

具有一定的感覺，它可以做的更好（例如使用子查詢）-asking y你怎麼能這樣做。

p.s.

SQLlite的東西將不勝感激！

謝謝！

Answer 1

或許，這將有助於

Declare @YourTable table (Id int,Date date,Price money,Item int,Type varchar(25)) 
Insert into @YourTable values 
(1,'2009-09-21',25,1,'M'), 
(2,'2009-08-31',16,2,'T'), 
(1,'2009-09-23',21,1,'M'), 
(2,'2009-09-03',12,3,'T') 

Select ID 
     ,sum(case when Type='M' then Price*Item else 0 end) as M 
     ,sum(case when Type='T' then Price*Item else 0 end) as T 
From YourTable 
Group By ID 

返回

ID M  T 
1 46.00 0.00 
2 0.00 68.00