Question

我正在使用SQL Server 2012，我有两个表Prospects和ProspectContact，其中包含以下示例数据：

ProspectID     ProspectName        ProspectAdd 
-----------------------------------------------
  1            ABC Company         India
  2            XYZ Company         UAE
  3            PQR Company         KSA
  4            JKL Company         INDIA

ProspectContacts 表：

ProspectID  CName        CAdd     CDesignation       Email
---------------------------------------------------------------------------
  1         Mr Sagar     India    Manager            sagar@gmail.com
  1         Mr Saurabh   India    Manager            Saurabh@gmail.com
  2         Mr Swami     UAE      Director           swami@gmail.com
  2         Mr .ABC      UAE      Engg               abc@gmail.com
  3         Mr PQR       KSA      Manager            pqr@gmail.com
  4         Mr XYZ       INDIA    Manager            xyz@gmail.com

如果我通过以下查询在上述表格上应用左联接

SELECT 
    P.[PROSPECTNAME], P.[ADDRESS], PC.CONTACTPERSON, PC.EMAILID
FROM 
    [PROSPECTS] P 
LEFT JOIN 
    [PROSPECTCONTACTS] PC ON P.PROSPECTID = PC.PROSPECTID
WHERE 
    P.USERID = @UserID 
ORDER BY 
    CDATE DESC

我得到了这个结果集：

ProspectName    Adress  Name        Email
---------------------------------------------------
ABC COMPANY     INDIA   Mr. Sagar   sagar@gmail.com
ABC COMPANY     INDIA   Mr. Saurabh saurabh@gmail.com

我的预期结果集是这样的：

ProspectName    Adress  Name1       Email1           Name2       Email2
-----------------------------------------------------------------------------
ABC COMPANY     INDIA   Mr. Sagar   sagar@gmail.com  Mr.Saurabh saurabh@gmail.com
XYZ COMPNAY     USA     Mr.Swami    swami@gmail.com  Mr. ABC    abc@gmail.com
PQR COMPANY     KSA     Mr.Pqr      pqr@gmail.com    NULL       NULL
JKL COMPNAY     INDIA   Mr.XYZ      xyz@gmail.com    NULL       NULL

Answer 1

尝试这样的事情：

SELECT P.[PROSPECTNAME], P.[ADDRESS], PC.CONTACTPERSON, PC.EMAILID
     FROM [PROSPECTCONTACTS] PC 
     LEFT JOIN [PROSPECTS] P 
     ON P.PROSPECTID=PC.PROSPECTID
WHERE P.USERID=@UserID ORDER BY CDATE Desc

SQL Server将左联接结果集显示为其他列而不是行

1 个答案: