SQL - 创建加入的临时表

Question

我正在寻找将两个表加入临时表，然后在选择查询中使用临时表。这是我想要创建的临时表的select语句：

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

什么是为上述创建临时表的最简单方法？

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

您可以创建一个临时表（和你可能想），但如果你不知道的，我想指出，你可以在这样

查询创建一个虚拟的临时表

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个这些表是这样的：

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

使用公用表表达式（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;