問題描述

我有一個這樣的查詢:

SELECT 
    ROW_NUMBER() OVER(ORDER BY USER_FNM, USER_LNM) AS ROW_NUM,
    USER_TEL, USER_FAX, USER_MOB            
FROM 
    BAUSER      
ORDER BY            
    CASE 
       WHEN @cOrderBy = 'USER_FNM_USER_LNM ASC' THEN USER_LNM 
    END ASC,
    CASE 
       WHEN @cOrderBy = 'USER_FNM_USER_LNM DESC' THEN USER_LNM 
    END DESC,
    CASE 
       WHEN @cOrderBy IS NULL THEN USER_KEY 
    END ASC
    OFFSET @iStartIndex ROWS
    FETCH NEXT @iRowsPerPage ROWS ONLY

我想做的是按兩列排序 - 但這顯示語法錯誤:

What I would like to do is sorting by two columns - but this is showing syntax error:

CASE WHEN @cOrderBy = 'USER_FNM_USER_LNM ASC' THEN USER_LNM, USER_FNM END ASC

知道在這種情況下如何按兩列排序嗎?

Any idea how to sort by two columns in this case?

推薦答案

CASE 是一個返回單個表達式/值的表達式.您需要為每一列編寫一個 CASE 語句:

CASE is an expression that returns a single expression/value. You need to write one CASE statement per column:

ORDER BY            
CASE WHEN @cOrderBy = 'USER_FNM_USER_LNM ASC'        THEN USER_LNM END ASC,
CASE WHEN @cOrderBy = 'USER_FNM_USER_LNM DESC'       THEN USER_LNM END DESC,
CASE WHEN @cOrderBy IS NULL                          THEN USER_KEY END ASC,

CASE WHEN @cOrderBy = 'USER_FNM_USER_LNM ASC'        THEN USER_FNM END ASC,
CASE WHEN @cOrderBy = 'USER_FNM_USER_LNM DESC'       THEN USER_FNM END DESC

更新(反映更新的問題)

由于您有 ROW_NUM 列，您可以按此排序:

Since you have ROW_NUM column, you can sort by that:

CASE WHEN @cOrderBy = 'USER_FNM_USER_LNM ASC'        THEN ROW_NUM END ASC,
CASE WHEN @cOrderBy = 'USER_FNM_USER_LNM DESC'       THEN ROW_NUM END DESC,
CASE WHEN @cOrderBy IS NULL 

這篇關于使用 CASE WHEN 按兩列排序的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！