將幾列連接到一個表中

Question

如何將它加入一個表？

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

（結果僅是示例）

Answer 1

您要執行的操作稱為樞軸。 這是您的數據的簡單示例：

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，您沒有提到的是您發布的查詢無效（您有多余的括號）。 以下是我認為您想要的答案：

從第一個例子...

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;

兩者都給：

a   b   c
1   2   3

Answer 3

這個怎么樣？

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