SQL - 創建加入的臨時表

Question

我正在尋找將兩個表加入臨時表，然後在選擇查詢中使用臨時表。這是我想要創建的臨時表的select語句：

select program, event 
from OMEGA.HP 
inner join POM.GT 
on program = substring(name,7,4) 
where LENGTH(name)= 25 

什麼是爲上述創建臨時表的最簡單方法？

Answer 1

select program, event 
into #temp --------------------------------check here 
from OMEGA.HP 
inner join POM.GT 
on program = substring(name,7,4) 
where LENGTH(name)= 25 

Answer 2

您可以創建一個臨時表（和你可能想），但如果你不知道的，我想指出，你可以在這樣

查詢創建一個虛擬的臨時表

SELECT * 
FROM (
    select program, event 
    from OMEGA.HP 
    inner join POM.GT on program = substring(name,7,4) 
    where LENGTH(name)= 25 
) AS Virtual_table 

，你甚至可以加入到另一個這些表是這樣的：

SELECT * 
FROM (
    select program, event 
    from OMEGA.HP 
    inner join POM.GT on program = substring(name,7,4) 
    where LENGTH(name)= 25 
) AS v_table74 
join (
    select program, event 
    from OMEGA.HP 
    inner join POM.GT on program = substring(name,2,5) 
    where LENGTH(name)= 25 
) as v_table25 on v_table74.program = v_table25.program 

Answer 3

使用公用表表達式（CTE）：

with temptablename(program, event) as (
    select program, event 
    from OMEGA.HP 
    inner join POM.GT 
    on program = substring(name,7,4) 
    where LENGTH(name)= 25 
) 
select program, event 
from temptablename;