如何將3個選擇語句合併爲一個？ （SQL Server 2008中）

Question

我有4個SQL語句，每個返回2列

select count(id) open, sum(amount) from A where status = 1 group by est_id 

結果：25 | 4400

select count(id) close, sum(amount) from A where status = 2 group by est_id 

結果：0 | 0

select count(id) stop, sum(amount) from A where status = 3 group by est_id 

結果：20 | 4000

我需要返回4 SQL SQL語句的結果之一，例如：

25 | 4400| active 
0 | 0 | inactive 
20 | 4000| close 

問候

Answer 1

正如@bluefeet你正在尋找的UNION ALL運營商提到。

select count(id) as c1, sum(amount) as c2, 'active' as c3 from A where status = 1 group by est_id 
union all 
select count(id), sum(amount), 'inactive' from A where status = 2 group by est_id 
union all 
select count(id), sum(amount), 'close' from A where status = 3 group by est_id 

組合結果集中的列名將取自第一個組件結果集。