需要查詢的輸出列

Question

HI

其實我需要一個像查詢：

select x from a as col1 , 
select y from b as col2 , 
select Z from c as col3 

和輸出應該像

col1 | col2 | col3 


x | y | z 

Answer 1

如果您確信表A，B和c沒有超過一行，你可以做到這一點。

select 
(select x from a) as col1 , 
(select y from b) as col2 , 
(select Z from c) as col3