Sql Server-左联接缺少记录

当只为Asset_Key=4744运行一个块时，我得到了2行，但当我离开join并返回B最终结果时，只为Asset_Key=4744返回了1行 但是如果我取消注释A.Asset_Key=4744，我将得到两条记录 请帮忙

SELECT  A.Asset_Key,Asset_Type,
A.Reason_Desc,A.NotReportingDate,A.ReportedEndDate,NULL AS Actual_ReportedDate,A.Asset_ID,A.CompanyCode
--,A.OEM_Key,A.Job_Code,A.Job_Desc,A.IC_Desc,A.ReportedDate
FROM
(
    SELECT  F.Asset_Key,F.Asset_Type,
    F.Reason_Desc,F.NotReportingDate,F.ReportedEndDate,NULL AS Actual_ReportedDate,F.Asset_ID,F.CompanyCode
    FROM
    (

        SELECT  Job_Code,Job_Desc,IC_Desc,Asset_Type,Reason_Desc,Asset_ID,CompanyCode,OEM_Key,
                NotReportingDate,ISNULL(ReportedDate,'2017-06-30') AS ReportedEndDate,ReportedDate,
                ROW_NUMBER() OVER(PARTITION BY Asset_ID,CompanyCode,OEM_Key,ReportedDate ORDER  BY RecordCreateTimestamp DESC) As Rank,
                Asset_Key
        FROM
        (
            SELECT  Job_Code,Job_Desc,IC_Desc,AJT.Asset_Type,DN.Reason_Desc,AJT.Asset_ID,AJT.CompanyCode,AJT.OEM_Key,
                    NotReportingDate,FN.ReportedDate,FN.Asset_Key,FN.RecordCreateTimestamp
            FROM    F_NOTREPORTING_REASON_TRACKING(NOLOCK) FN
            JOIN    D_NOTREPORTING_REASON(NOLOCK) DN ON FN.NotReportingReason_Key=DN.NotReportingReason_Key
            JOIN    D_ASSET_JOB_TRACKING (NOLOCK) AJT ON AJT.Asset_Key=FN.Asset_Key AND AJT.Is_Active_flag='Y'
            WHERE   CONVERT(VARCHAR(6),ReportedDate,112)=201706
            AND     CONVERT(VARCHAR(6),FN.NotReportingDate,112)<=201706
            AND     AJT.Asset_Type NOT IN('Concrete Batching Plants')
            --AND       FN.ReportedDate>=FN.NotReportingDate

            UNION

            SELECT  E.Job_Code,E.Job_Desc,E.IC_Desc,E.Asset_Type,E.Reason_Desc,E.Asset_ID,E.CompanyCode,E.OEM_Key,
                    E.NotReportingDate,E.ReportedDate,E.Asset_Key,
                    E.RecordCreateTimestamp
            FROM
            (
                SELECT  Job_Code,Job_Desc,IC_Desc,AJT.Asset_Type,DN.Reason_Desc,AJT.Asset_ID,AJT.CompanyCode,AJT.OEM_Key,
                        NotReportingDate,
                        ISNULL(LEAD(FN.NotReportingDate,1) OVER(PARTITION BY AJT.Asset_ID,AJT.CompanyCode,AJT.OEM_Key ORDER  BY AJT.RecordCreateTimestamp DESC),'2017-06-30') AS ReportedDate,FN.Asset_Key,
                        FN.RecordCreateTimestamp

                FROM    F_NOTREPORTING_REASON_TRACKING(NOLOCK) FN
                JOIN    D_NOTREPORTING_REASON(NOLOCK) DN ON FN.NotReportingReason_Key=DN.NotReportingReason_Key
                JOIN    D_ASSET_JOB_TRACKING (NOLOCK) AJT ON AJT.Asset_Key=FN.Asset_Key AND AJT.Is_Active_flag='Y'
                WHERE   FN.ReportedDate IS NULL 
                AND     CONVERT(VARCHAR(6),FN.NotReportingDate,112)<=201706
                AND     AJT.Asset_Type NOT IN('Concrete Batching Plants')
            )E
            WHERE (CONVERT(VARCHAR(6),E.ReportedDate,112)=201706)
        )C

    )F
    --WHERE A.Asset_Key is null
)A
LEFT OUTER JOIN
(
            SELECT  AU1.Asset_Key,D.Full_Date

            FROM    D_DATE D
            JOIN    VW_IOT_ANALYTICS_DASHBOARDAllDates AU1(NOLOCK)  ON AU1.Date_Key=D.Date_Key 
            JOIN    D_ASSET_JOB_TRACKING AJT1(NOLOCK) ON AU1.Asset_Key=AJT1.Asset_Key AND AJT1.Is_Active_flag='Y'
            WHERE   CONVERT(VARCHAR(6),D.Full_Date,112)=201706
            AND     AJT1.Asset_Type NOT IN('Concrete Batching Plants')


)B ON A.Asset_Key=B.Asset_Key --AND (B.Full_Date BETWEEN A.NotReportingDate AND A.ReportedEndDate)

--where A.Asset_ID='01180363'
--where a.asset_id like '0118036%'
--where A.Asset_Key=4744
order by a.Asset_Key

---

或者，当您只运行块A时，A.Asset_Key是null检查Asset_Key value？我不明白您能否简单解释一下为什么要将日期转换为varchar6，然后将结果与整数值而不是字符串值进行比较？非主题：其中CONVERTVARCHAR6，E.ReportedDate，112=201706是处理日期/时间信息的一种不好的方式，将数据bad转换为varcharslow，并与integer bad进行比较。不要更改数据以适合您的过滤器，请执行相反的操作，例如e.ReportedDate>='201706'和e.ReportedDate<'201707'