SQL - ROW_NUMBER () OVER (ORDER BY) 不起作用

Question

我在 ORDER BY 中放了什么无关紧要子句，结果集的顺序不会改变。

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

Answer 1

ORDER BY 仅在应用于最外层 SELECT 语句时控制返回行的顺序。

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