选择查询中的重复或相同记录

Question

我尝试执行从不同表中选择的选择查询，但是即使使用“ DISTINCT”，我仍然会得到重复的记录。

SELECT DISTINCT CSC.POLICYNO 
    ,PSA.WORKFLOWID 
    ,CSC.POLICYHOLDERNAME
    ,CSC.TASKTYPE 
    ,CSC.PRODUCTCODE
    ,WF.STATUS
    ,(SELECT concat(USR.SFIRSTNAME, USR.SLASTNAME) where USR.lseqid = (select psa.userid where psa.actiontype IN(602))) AS DE_Name
    ,PSA.CREATEDATE AS DE_Start_date
    ,(SELECT UPDATEDATE FROM C_WF_PS_AUDITTRAIL WHERE WORKFLOWID = PSA.WORKFLOWID AND  ACTIONTYPE IN (603) ) as DE_End_date
FROM C_WF_PS_AUDITTRAIL PSA  
INNER JOIN MUSER USR ON USR.LSEQID = PSA.USERID 
INNER JOIN C_WF_PS_WORKFLOW WF ON WF.WORKFLOWID = PSA.WORKFLOWID
INNER JOIN C_CSC_PS_CACHE CSC ON CSC.POLICYNO = WF.POLICYNO
WHERE WF.POLICYNO = CSC.POLICYNO
AND  MONTH (PSA.CREATEDATE) = @month AND YEAR(PSA.CREATEDATE) = @year

我尝试执行从不同表中选择的选择查询，但是即使使用“ DISTINCT”，我仍然会得到重复的记录。下面是查询的结果附加。 SELECT DISTINCT CSC ....

Answer 1

您可以在行尾添加一个组。

Answer 2

DE_Name在2行之间不同。没错。