[英]How to get Top 25 records order by createdon using SQL query?
我有兩個表像updatetext和用戶我想要從updatetext頂部不同的記錄..表用戶有唯一的記錄相關的用戶信息和updatetext有多個updatetext記錄...我想從updatetext表獲得最新的最新更新..我怎么樣可以得到?
Users Table
1) userid
2) username
3) password
4) createdon
UpdateText Table
1) updatetextID
2) userid
3) updateScrap
4) createdon
3) location
UPDATETEXT
updatetextID userid updateScrap Createdon
11 535 yes good test 2/23/2011 9:59
12 540 udpate sample 2/23/2011 9:58
13 44 Absas 2/22/2011 12:30
14 20 test text 123 2/22/2011 12:24
15 540 hi how are you? 2/22/2011 12:00
16 535 Hi r u there? 2/22/2011 12:30
17 540 welcome back 2/22/2011 10:23
用戶
userid username password
535 abhi
540 shankar
44 dhaval
20 john
我想從UpdateText表中獲取最佳創建記錄並從Users表中獲取用戶名和密碼..請幫助我。
這是前25名,每位用戶的最新更新。 我猜這就是你的意思
;WITH CTE AS
(
SELECT
*,
ROW_NUMBER() OVER (PARTITION BY userid ORDER BY createdon) AS RankNum
FROM
[UpdateText]
)
SELECT TOP 25
*
FROM
CTE
JOIN
Users U ON CTE.userid = U.userid
WHERE
RankNum = 1
ORDER BY
CTE.createdon
SELECT TOP 25
ut.*
,u.username
,u.password
FROM [UpdateText] ut
JOIN Users u ON ut.userid = u.userid
JOIN ( SELECT MAX(ut2.createdon) as maxcreatedon
,ut2.userid
FROM [UpdateText] ut2
GROUP BY ut2.userid
) x ON x.maxcreatedon = ut.createdon
AND x.userid = ut.userid
ORDER BY ut.createdon DESC
也許你正在尋找這樣的東西?
不確定我是否完全理解,但嘗試類似:
SELECT * FROM UpdateText
INNER JOIN Users ON UpdateText.userid = Users.userid
ORDER BY UpdateText.createdon DESC LIMIT 25
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