sql - 在 SQL 中组合两个查询

Question

基本上我需要结合这两个查询的结果，其中 PSROLEUSER 在两个表中都相等。我该怎么做？

select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'NCC_Manag';
select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'HRM-Content Amin';

Answer 1

下面的查询假定ROLENAME每个PSROLEUSER.

SELECT  PSROLEUSER 
FROM    sysadm.PSROLEUSER 
WHERE   ROLENAME IN ('NCC_Manag', 'HRM-Content Amin')
GROUP   BY PSROLEUSER
HAVING  COUNT(*) = 2

• 关系划分的SQL

Answer 2

这是一种将所有逻辑都放在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;

我喜欢这种方法，因为它非常通用。例如，如果你想要所有'NCC_Manag'不是的， 'HRM_Content Amin'你会这样做：

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;

Answer 3

另一种方式：

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

Answer 4

select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME in('NCC_Manag','HRM-Content Amin')

试试这个代码

Answer 5

select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'NCC_Manag'
UNION
select PSROLEUSER from sysadm.PSROLEUSER where ROLENAME = 'HRM-Content Amin'

假设它们返回相同的模式，只需合并它们。

Answer 6

您也可以使用 EXISTS 运算符的另一个版本。

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
              )

见演示SQLFiddle

Answer 7

select distinct psroleuser from psroleuser where rolename = 'NCC_Manag'
and psroleuser in 
(select psroleuser from psroleuser where rolename = 'HRM-Content Amin')