得到重复的行

Question

我无法理解为什么我会获得以下查询的重复数据。虽然我使用了不同的。

查询如下 - 请帮助： 可能是连接的一些问题

SELECT DISTINCT(UM.USERNAME)'USER_NAME'
        ,UM.FIRSTNAME + ' ' + UM.LASTNAME AS 'EMPLOYEE NAME'
        ,US.USER_NAME 'USER_ID'
        ,US.MS_RIT_REPORTING_GROUP_MST_KEY
        ,RG.REPORTING_GROUP_NAME
        ,US.MS_RIT_REGION_MST_KEY
        ,RM.REGION_NAME
        ,US.MS_RIT_SUB_REGION_MST_KEY
        ,SM.SUB_REGION_NAME
        ,TP.TASK_MST_KEY
        ,TTM.TASK_TYPE_NAME
        ,CT.*
        ,FM.TASK_STATUS
        ,FM.TASK_START_DATE
        ,FM.TASK_END_DATE
        ,SRM.ROLE_NAME AS ROLENAME
    FROM USERS_MASTER UM
    INNER JOIN MS_RIT_USER_SKILLSET_MAP US ON UM.USERID = US.USER_NAME
    INNER JOIN DIM_MS_RIT_REPORTING_GROUP_MST RG ON US.MS_RIT_REPORTING_GROUP_MST_KEY = RG.MS_RIT_REPORTING_GROUP_MST_KEY
        AND UPPER(RG.ACTIVE) IN ('YES','1','Y')
    INNER JOIN DIM_MS_RIT_REGION_MST RM ON US.MS_RIT_REGION_MST_KEY = RM.MS_RIT_REGION_MST_KEY
        AND UPPER(RM.ACTIVE) IN ('YES','1','Y')
    INNER JOIN DIM_MS_RIT_SUB_REGION_MST SM ON US.MS_RIT_SUB_REGION_MST_KEY = SM.MS_RIT_SUB_REGION_MST_KEY
        AND UPPER(SM.ACTIVE) IN ('YES','1','Y')
    INNER JOIN MS_RIT_USER_TASK_MAP TP ON CONVERT(VARCHAR,UM.USERID) = TP.USER_ID
    INNER JOIN MS_RIT_CREATE_TASK CT ON CT.TASK_ID = TP.TASK_MST_KEY
    INNER JOIN WF_FRM_28_MST FM ON FM.TASK_ID = CT.TASK_ID
    INNER JOIN SEC_USER_ROLE SR ON SR.USER_ID = UM.USERNAME
    INNER JOIN SEC_ROLE_MST SRM ON SRM.ROLE_CODE = SR.ROLE_CODE
    INNER JOIN MS_RIT_TASK_TYPE_MASTER TTM ON CT.TASK_TYPE = TTM.TASK_TYPE_ID

Answer 1

使用UNION删除重复项

检查是否有重复项的一个解决方案是使用相同的查询执行UNION，如果没有删除任何行，则它们不是重复项。

(SELECT DISTINCT(UM.USERNAME)'USER_NAME'
        ,UM.FIRSTNAME + ' ' + UM.LASTNAME AS 'EMPLOYEE NAME'
        ,US.USER_NAME 'USER_ID'
        ,US.MS_RIT_REPORTING_GROUP_MST_KEY
        ,RG.REPORTING_GROUP_NAME
        ,US.MS_RIT_REGION_MST_KEY
        ,RM.REGION_NAME
        ,US.MS_RIT_SUB_REGION_MST_KEY
        ,SM.SUB_REGION_NAME
        ,TP.TASK_MST_KEY
        ,TTM.TASK_TYPE_NAME
        ,CT.*
        ,FM.TASK_STATUS
        ,FM.TASK_START_DATE
        ,FM.TASK_END_DATE
        ,SRM.ROLE_NAME AS ROLENAME
    FROM USERS_MASTER UM
    INNER JOIN MS_RIT_USER_SKILLSET_MAP US ON UM.USERID = US.USER_NAME
    INNER JOIN DIM_MS_RIT_REPORTING_GROUP_MST RG ON US.MS_RIT_REPORTING_GROUP_MST_KEY = RG.MS_RIT_REPORTING_GROUP_MST_KEY
        AND UPPER(RG.ACTIVE) IN ('YES','1','Y')
    INNER JOIN DIM_MS_RIT_REGION_MST RM ON US.MS_RIT_REGION_MST_KEY = RM.MS_RIT_REGION_MST_KEY
        AND UPPER(RM.ACTIVE) IN ('YES','1','Y')
    INNER JOIN DIM_MS_RIT_SUB_REGION_MST SM ON US.MS_RIT_SUB_REGION_MST_KEY = SM.MS_RIT_SUB_REGION_MST_KEY
        AND UPPER(SM.ACTIVE) IN ('YES','1','Y')
    INNER JOIN MS_RIT_USER_TASK_MAP TP ON CONVERT(VARCHAR,UM.USERID) = TP.USER_ID
    INNER JOIN MS_RIT_CREATE_TASK CT ON CT.TASK_ID = TP.TASK_MST_KEY
    INNER JOIN WF_FRM_28_MST FM ON FM.TASK_ID = CT.TASK_ID
    INNER JOIN SEC_USER_ROLE SR ON SR.USER_ID = UM.USERNAME
    INNER JOIN SEC_ROLE_MST SRM ON SRM.ROLE_CODE = SR.ROLE_CODE
    INNER JOIN MS_RIT_TASK_TYPE_MASTER TTM ON CT.TASK_TYPE = TTM.TASK_TYPE_ID)

    UNION

(SELECT DISTINCT(UM.USERNAME)'USER_NAME'
        ,UM.FIRSTNAME + ' ' + UM.LASTNAME AS 'EMPLOYEE NAME'
        ,US.USER_NAME 'USER_ID'
        ,US.MS_RIT_REPORTING_GROUP_MST_KEY
        ,RG.REPORTING_GROUP_NAME
        ,US.MS_RIT_REGION_MST_KEY
        ,RM.REGION_NAME
        ,US.MS_RIT_SUB_REGION_MST_KEY
        ,SM.SUB_REGION_NAME
        ,TP.TASK_MST_KEY
        ,TTM.TASK_TYPE_NAME
        ,CT.*
        ,FM.TASK_STATUS
        ,FM.TASK_START_DATE
        ,FM.TASK_END_DATE
        ,SRM.ROLE_NAME AS ROLENAME
    FROM USERS_MASTER UM
    INNER JOIN MS_RIT_USER_SKILLSET_MAP US ON UM.USERID = US.USER_NAME
    INNER JOIN DIM_MS_RIT_REPORTING_GROUP_MST RG ON US.MS_RIT_REPORTING_GROUP_MST_KEY = RG.MS_RIT_REPORTING_GROUP_MST_KEY
        AND UPPER(RG.ACTIVE) IN ('YES','1','Y')
    INNER JOIN DIM_MS_RIT_REGION_MST RM ON US.MS_RIT_REGION_MST_KEY = RM.MS_RIT_REGION_MST_KEY
        AND UPPER(RM.ACTIVE) IN ('YES','1','Y')
    INNER JOIN DIM_MS_RIT_SUB_REGION_MST SM ON US.MS_RIT_SUB_REGION_MST_KEY = SM.MS_RIT_SUB_REGION_MST_KEY
        AND UPPER(SM.ACTIVE) IN ('YES','1','Y')
    INNER JOIN MS_RIT_USER_TASK_MAP TP ON CONVERT(VARCHAR,UM.USERID) = TP.USER_ID
    INNER JOIN MS_RIT_CREATE_TASK CT ON CT.TASK_ID = TP.TASK_MST_KEY
    INNER JOIN WF_FRM_28_MST FM ON FM.TASK_ID = CT.TASK_ID
    INNER JOIN SEC_USER_ROLE SR ON SR.USER_ID = UM.USERNAME
    INNER JOIN SEC_ROLE_MST SRM ON SRM.ROLE_CODE = SR.ROLE_CODE
    INNER JOIN MS_RIT_TASK_TYPE_MASTER TTM ON CT.TASK_TYPE = TTM.TASK_TYPE_ID)