SQL - ROW_NUMBER () OVER (ORDER BY) 不起作用
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时间：2020-09-01 15:06:24 来源:igfitidea点击:
SQL - ROW_NUMBER () OVER (ORDER BY) not working
提问by Redtopia
It doesn't matter what I put in the ORDER BYclause, the order of the result set doesn't change.
不管我在ORDER BY子句中放了什么，结果集的顺序都不会改变。
WITH Results AS (
SELECT DISTINCT
MessageThreadUsers.threadFK,
MessageThreads.threadDate,
Messages.MessageBody,
Messages.senderFK,
Users.userFullName AS senderFullName,
ROW_NUMBER() OVER (ORDER BY MessageThreads.threadDate DESC) AS RowNumber
FROM MessageThreadUsers
JOIN MessageThreads ON MessageThreadUsers.threadFK = MessageThreads.threadID
JOIN Messages ON MessageThreads.threadDate = Messages.messageDate
JOIN Users ON Messages.senderFK = Users.userID
WHERE userFK = 'usr_developer'
)
SELECT * FROM Results WHERE RowNumber BETWEEN 1 AND 10
回答by RBarryYoung
ORDER BY only controls the order of returned rows when it is applied to the outermost SELECT statement.
ORDER BY 仅在应用于最外层 SELECT 语句时控制返回行的顺序。
This may work better:
这可能效果更好：
WITH Results AS (
SELECT DISTINCT
MessageThreadUsers.threadFK,
MessageThreads.threadDate,
Messages.MessageBody,
Messages.senderFK,
Users.userFullName AS senderFullName,
ROW_NUMBER() OVER (ORDER BY MessageThreads.threadDate DESC) AS RowNumber
FROM MessageThreadUsers
JOIN MessageThreads ON MessageThreadUsers.threadFK = MessageThreads.threadID
JOIN Messages ON MessageThreads.threadDate = Messages.messageDate
JOIN Users ON Messages.senderFK = Users.userID
WHERE userFK = 'usr_developer'
)
SELECT * FROM Results WHERE RowNumber BETWEEN 1 AND 10
ORDER BY RowNumber
