做在SQL Server中加入

我試圖實現加入其中的SELECT語句多列，將在特定表引用相同的名稱，例如：做在SQL Server中加入

SELECT 
    sh.shift_number, 
    sh.workplace_num, 
    wp.workplace_name, 
    sh.workplace_num2, 
    sh.workplace_num3 
FROM shifts AS sh 
INNER JOIN workplace AS wk 
    ON wp.workplace_num = wk.workplace_num

我的問題是我抽到第一工作場所，我怎麼得到workplace2或工作場所3

Shift_number | workplace_Num | workplace_name | workplace_Num2 | workplace_Num3 
4   | 2    | Teller   | 3    | 4

正如你可以看到ØWk_placename（出納）相同的名稱顯示wk_placeNum至名（2）我想能夠顯示Wk_placeNum2和Wk_placeNum3的名稱，他們都將參加工作單位的職位名稱王牌桌！

我被限制上傳一張圖片，希望插圖畫一張圖片！

來源

2017-05-30 brenden ozie

請更新您的問題，我們展示了目前你所得到的輸出，連同你想要的輸出成爲。樣本數據也會有幫助。 –

@TimBiegeleisen盡我所能，請檢查你是否可以協助 –

我仍然不明白你在問什麼。 –

你必須加入多次到工作場所表。請注意，因爲您沒有指定字段workplace_num2和workplace_num3是否可以爲空，所以我假設這些都是如此使用LEFT JOIN。您應該使用INNER JOIN如果這些不可爲空：

SELECT 
    sh.shift_number, 
    sh.workplace_num, 
    wp.workplace_name, 
    sh.workplace_num2, 
    wp2.workplace_name as workplace_name2, 
    sh.workplace_num3 
    wp3.workplace_name as workplace_name3, 
FROM shifts AS sh 
INNER JOIN workplace AS wp 
    ON sh.workplace_num = wp.workplace_num 
LEFT JOIN workplace AS wp2 
    ON sh.workplace_num2 = wp2.workplace_num 
LEFT JOIN workplace AS wp3 
    ON sh.workplace_num3 = wp3.workplace_num

來源

2017-05-30 09:44:12 xtoik

試試這個：

SELECT 
    sh.shift_number, 
    sh.workplace_num, 
    wk.workplace_name, 
    wk2.workplace_name, 
    wk3.workplace_name 
FROM shifts AS sh 
INNER JOIN workplace AS wk 
    ON sh.workplace_num = wk.workplace_num 
INNER JOIN workplace AS wk2 
    ON sh.workplace_num2 = wk2.workplace_num 
INNER JOIN workplace AS wk3 
    ON sh.workplace_num3 = wk3.workplace_num

來源

2017-05-30 09:49:14 nacho

做在SQL Server中加入

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