如何从两个t-sql select中组合两列？

Question

我正在使用t-sql。 我想用两个coulmns返回一个dataTable：A，B

但是'union'不是这样。我应该使用什么语法？

select Params as A 
from Table1 
where ID = '1' 

union 

select Params as B 
from Table1 
where ID = '2' 

更新：很抱歉，我有一个错字：@CITD => ID

TIA

Answer 1

select T1.Params as A, T2.Params as B 
from Table1 T1 
INNER JOIN Table1 T2 ON @CTID = '1' AND @ID = '2' 

希望这有助于。

Answer 2

不知道如何A和B涉及其不可能创造一个合乎逻辑的结果集既没有A或B等于NULL一个记录。

下面会给你1个结果2列设置，但将需要。如果你希望他们是如何关联的详细信息“合并”更多：

select Params as A, NULL as B 
from Table1 
where @CTID = '1' 

union 

select NULL as A, Params as B 
from Table1 
where @ID = '2' 

Answer 3

SELECT 
    MAX(CASE ID WHEN '1' THEN Params END) AS A, 
    MAX(CASE ID WHEN '2' THEN Params END) AS B 
FROM Table1 
WHERE ID IN ('1', '2')