本文介紹了使用 CASE WHEN 按兩列排序的處理方法,對(duì)大家解決問題具有一定的參考價(jià)值,需要的朋友們下面隨著小編來一起學(xué)習(xí)吧!
問題描述
限時(shí)送ChatGPT賬號(hào)..
我有一個(gè)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(cuò)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(gè)返回單個(gè)表達(dá)式/值的表達(dá)式.您需要為每一列編寫一個(gè) 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
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