[英]Join results of multiple select statements in sql
我有四个select语句,我想将它们全部加入,只得到公共行。
在一个示例中,我提供了2条select语句:
SELECT
h.userid, 'Activity' as table_name,
h.stamp,
DATEDIFF(dd, kh.LatestDate, GETDATE()) as days_since,
m.group_name
FROM
([Animal].[SYSADM].[activity_history] h
INNER JOIN
(SELECT userid, MAX(stamp) as LatestDate
FROM [Animal].[SYSADM].[activity_history]
GROUP BY userid) kh ON h.userid = kh.userid AND h.stamp = kh.LatestDate)
LEFT OUTER JOIN
[Animal].[SYSADM].secure_member m ON m.user_name = h.userid
WHERE
(DATEDIFF(dd, kh.LatestDate, GETDATE()) > 90)
AND NOT (m.group_name = 'inactive')
ORDER BY
userid
SELECT
h.userid, 'Person' as table_name, h.stamp,
DATEDIFF(dd, kh.LatestDate, GETDATE()) as days_since,
m.group_name
FROM
([Animal].[SYSADM].[person_history] h
INNER JOIN
(SELECT userid, max(stamp) as LatestDate
FROM [Animal].[SYSADM].[person_history]
GROUP BY userid) kh ON h.userid = kh.userid AND h.stamp = kh.LatestDate)
LEFT OUTER JOIN
[Animal].[SYSADM].secure_member m ON m.user_name = h.userid
WHERE
(DATEDIFF(dd, kh.LatestDate, GETDATE()) > 90)
AND NOT (m.group_name = 'inactive')
ORDER BY
userid
我已经尝试过INTERSECT
,但是它没有返回任何行,我想查看两个select语句中的公共行(实际上我有4个,所以我相信2的工作原理将适用于4)
提前致谢。
更新:
我在2条select语句上尝试了内部联接,它给了我想要的结果,但是现在的问题是我如何在4条select语句上使用内部联接。
SELECT DISTINCT t1.userid as A_UserID, t2.userid as P_UserID, t1.stamp as A_stamp, t2.stamp as P_stamp, datediff(dd,t1.stamp,GetDate()) as A_days_since, datediff(dd,t2.stamp,GetDate()) as P_days_since, t1.group_name, t1.table_name, t2.table_name
from
(SELECT h.userid, 'Activity' as table_name, h.stamp, datediff(dd,kh.LatestDate,GetDate()) as days_since, m.group_name
FROM
( [Animal].[SYSADM].[activity_history] h
inner join (
select userid, max(stamp) as LatestDate
from [Animal].[SYSADM].[activity_history]
group by userid
) kh on h.userid = kh.userid and h.stamp = kh.LatestDate
)
left outer join [Animal].[SYSADM].secure_member m on m.user_name = h.userid
where
(datediff(dd,kh.LatestDate, GetDate()) > 90)
and not (m.group_name = 'inactive')) t1
inner join
(SELECT h.userid, 'Person' as table_name, h.stamp, datediff(dd,kh.LatestDate,GetDate()) as days_since, m.group_name
FROM
( [Animal].[SYSADM].[person_history] h
inner join (
select userid, max(stamp) as LatestDate
from [Animal].[SYSADM].[person_history]
group by userid
) kh on h.userid = kh.userid and h.stamp = kh.LatestDate
)
left outer join [Animal].[SYSADM].secure_member m on m.user_name = h.userid
where
(datediff(dd,kh.LatestDate, GetDate()) > 90)
and not (m.group_name = 'inactive')) t2
on
t1.userid = t2.userid
order by T1.userid
暂时忘掉UNION
。 假设您得到该结果并插入到Table1
然后,根据您的意思说“普通行”。 如果您想要确切的值但在不同的表中
SELECT userid, h.stamp, days_since, m.group_name
FROM Table1
GROUP BY userid, h.stamp, days_since, m.group_name
HAVING COUNT( table_name ) = 2 -- in this case 2 because are two types
-- Activity and Persons
查看查询结果后,还需要向UNION
上的每个查询中添加DISTINCT
。
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