将几列连接到一个表中

Question

如何将其加入一个表？

select xxx.* from
(
(select a from x where a in (q)) as kk,
(select a from x where a in (w)) as hh,
(select a from x where a in (e)) as gg
) xxx

我想得到：

gg|hh|kk
---------
1 |2 |3

（结果只是一个例子）

Answer 1

您要做的事情称为支点。以下是您的数据的简单示例：

WITH cte AS (
    SELECT xxx.* from
    (
    (select 1 as val, 'a' AS id) UNION ALL
    (select 2 as val, 'b' AS id) UNION ALL
    (select 3 as val, 'c' AS id)
    ) AS xxx
)
SELECT *
FROM cte AS p
PIVOT (MAX(val) FOR id IN ([a], [b], [c])) AS pvt

Answer 2

好的，你没有提到的是你发布的查询不起作用（你有额外的括号）。以下是我认为你想要的答案：

从你的第一个例子......

select * 
from
(select 1 as a) as table1,
(select 2 as b) as table2,
(select 3 as c) as table3;

如果您有多列：

select table1.aa as a, table2.bb as b, table3.cc as c
from
(select 1 as aa, 11 as aaa) as table1,
(select 2 as bb, 22 as bbb) as table2,
(select 3 as cc, 33 as ccc) as table3;

两者都给：

a   b   c
1   2   3

Answer 3

这个怎么样？

select xxx.*
from (select 1 as a, 2 as b, 3 as c) as xxx;