[英]Combining Two Queries in SQL
基本上,我需要合並兩個表中PSROLEUSER相等的兩個查詢的結果。 我該怎么做?
select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'NCC_Manag';
select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'HRM-Content Amin';
下面的查詢假定ROLENAME
對於每個PSROLEUSER
都是唯一的。
SELECT PSROLEUSER
FROM sysadm.PSROLEUSER
WHERE ROLENAME IN ('NCC_Manag', 'HRM-Content Amin')
GROUP BY PSROLEUSER
HAVING COUNT(*) = 2
這是一種將所有邏輯放在having
子句中的方法:
select PSROLEUSER
from sysadm.PSROLEUSER
group by PSROLEUSER
having sum(case when ROLENAME = 'NCC_Manag' then 1 else 0 end) > 0 and
sum(case when ROLENAME = 'HRM-Content Amin' then 1 else 0 end) > 0;
我喜歡這種方法,因為它很籠統。 舉例來說,如果你希望所有'NCC_Manag'
不在 'HRM_Content Amin'
,你會怎么做:
select PSROLEUSER
from sysadm.PSROLEUSER
group by PSROLEUSER
having sum(case when ROLENAME = 'NCC_Manag' then 1 else 0 end) > 0 and
sum(case when ROLENAME = 'HRM-Content Amin' then 1 else 0 end) = 0;
其他方式:
select X.PSROLEUSER from
(select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'NCC_Manag') X inner join
(select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'HRM-Content Amin') Y
on X.PSROLEUSER = Y.PSROLEUSER
select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME in('NCC_Manag','HRM-Content Amin')
試試這個代碼
select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'NCC_Manag'
UNION
select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'HRM-Content Amin'
假設它們返回相同的架構,只需對其進行合並。
您也可以將另一個版本與EXISTS運算符一起使用。
SELECT t1.PSROLEUSER
FROM sysadm.PSROLEUSER t1
WHERE t1.ROLENAME = 'NCC_Manag'
AND EXISTS (
SELECT 1
FROM sysadm.PSROLEUSER t2
WHERE t2.ROLENAME = 'HRM-Content Amin'
AND t1.PSROLEUSER = t2.PSROLEUSER
)
參見有關SQLFiddle
演示
select distinct psroleuser from psroleuser where rolename = 'NCC_Manag'
and psroleuser in
(select psroleuser from psroleuser where rolename = 'HRM-Content Amin')
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