MSSQL兩個內部連接到同一個表

我有一個表列出了一堆時間表（TK.DETAIL）。MSSQL兩個內部連接到同一個表

在該表中所引用的員工ID，我可以成功地使用從員工表（EMMain）拉頭名和姓

的TK.DETAIL表也顯示了我一個項目ID和我可以通過INNER加入項目表（PR）獲得該項目的主管ID。

我想要做的就是加入公關公司和EMMain表獲得主管的名字和姓氏。

我當前的查詢爲我提供了與僱員ID相同的名字和姓氏。

我在做什麼錯。

SELECT  tkDetail.Employee, tkDetail.WBS1, tkDetail.WBS2, tkDetail.LineItemApprovalStatus, tkDetail.LineItemApprover, PR.Supervisor, EMMain.LastName, EMMain.FirstName,EMMain.FirstName AS SupervisorFirst, EMMain.LastName AS supervisorlast 
FROM   tkDetail INNER JOIN 
         PR ON tkDetail.WBS1 = PR.WBS1 INNER JOIN 
         EMMain ON tkDetail.Employee = EMMain.Employee INNER JOIN 
         EMMain AS EMPL ON PR.Supervisor = EMMain.Employee 

WHERE (LineItemApprovalStatus is NULL)

來源

2017-11-11 Ankh2054

你確定第二次加入「AND PR.Supervisor = EMMain.Employee」嗎？這意味着EMMain.Employee = tkDetail.Employee = PR.Supervisor – Radu

這就是我不知道的。 EMMain.Employee是員工ID。 tkDetail.Employee和PR.Supervisor也是員工ID – Ankh2054

嘗試使用以下內容獲取Supervisor Firstname和Kastname。 EMMain.FirstName AS SupervisorFirst，EMMain.LastName AS supervisorlas – Ankh2054

請參閱如果不加入幫助和照顧的是在第三次加入時你應該使用EMPL別名而不是表名再次

 SELECT tkDetail.Employee, tkDetail.WBS1, tkDetail.WBS2, 
    tkDetail.LineItemApprovalStatus, tkDetail.LineItemApprover, 
    PR.Supervisor, EMMain.LastName, EMMain.FirstName,SUP.FirstName AS 
     SupervisorFirst, SUP.LastName AS supervisorlast 
FROM tkDetail 
INNER JOIN PR ON tkDetail.WBS1 = PR.WBS1 
left JOIN EMMain ON tkDetail.Employee = EMMain.Employee 
left JOIN EMMain SUP ON PR.Supervisor = SUP.Employee WHERE (LineItemApprovalStatus is NULL)

來源

2017-11-11 13:07:08 Radu

嗨拉杜，不stil不好。我已經嘗試了右，左/左，左/左，RGITH /右，右。 – Ankh2054

我想我找到了:) 在選擇字段列表中，我更改爲SUP.FirstNAme和SUP.LASTNAME，並在最後一個左側加入我已更改爲SUP別名，請參閱我的回答編輯:) – Radu

感謝Radu，你是男人！ – Ankh2054

沒有數據還很難說，但嘗試做這樣的

SELECT * 
FROM tkDetail 
INNER JOIN PR ON tkDetail.WBS1 = PR.WBS1 
INNER JOIN EMMain PR.Supervisor = EMMain.Employee 
WHERE (LineItemApprovalStatus is NULL)

來源

2017-11-11 12:28:22 Sonikas

也許它會像那：

SELECT tkDetail.Employee, tkDetail.WBS1, tkDetail.WBS2, tkDetail.LineItemApprovalStatus, tkDetail.LineItemApprover, PR.Supervisor, EMMain.LastName, EMMain.FirstName,EMMain.FirstName AS SupervisorFirst, EMMain.LastName AS supervisorlast 
    FROM tkDetail INNER JOIN 
    EMMain ON tkDetail.Employee = EMMain.Employee INNER JOIN 
    PR ON tkDetail.WBS1 = PR.WBS1 AND EMMain.Employee = PR.Supervisor 
    WHERE (LineItemApprovalStatus is NULL)

來源

2017-11-11 12:38:11 Radu

對不起，它然後更改supervisorID以匹配員工ID – Ankh2054

是從您的問題的第一個版本是相同的條件:) – Radu

嘗試使用最後兩個左連接加入:) SELECT tkDetail.Employee，tkDetail.WBS1，tkDetail.WBS2，tkDetail.LineItemApprovalStatus，tkDetail.LineItemApprover，PR.Supervisor，EMMain.LastName，EMMain.FirstName，EMMain.FirstName AS SupervisorFirst，EMMain.LastName AS supervisorlast FROM tkDetail INNER JOIN PR ON tkDetail.WBS1 = PR.WBS1 LEFT JOIN EMMain ON tkDetail.Employee = EMMain.Employee LEFT JOIN EMMain AS EMPL ON PR.Supervisor = EMMain.Employee WHERE（李neItemApprovalStatus是NULL） – Radu

MSSQL兩個內部連接到同一個表

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