SQL Update複数の列から値が取得され、単一のクエリとして別のテーブルから取得するクエリ

Question

PIテーブルから選択するLCID、LCNo、AmendmentStatusという3つの列を更新したいので、次の更新クエリを書き込んでいます：

UPDATE #TempTableOne 
    SET  
      LCID=(SELECT ISNULL(ExportLCID,0) FROM ExportLC WHERE ExportLCID= (SELECT LCID FROM [PI] WHERE PIID=(SELECT PIID FROM Job WHERE JobID=TT.OrderID))), 
      LCNo=(SELECT ISNULL(ExportLCNo,'') FROM ExportLC WHERE ExportLCID= (SELECT LCID FROM [PI] WHERE PIID=(SELECT PIID FROM Job WHERE JobID=TT.OrderID))), 
      AmendmentStatus=(SELECT AmendmentStatus FROM ExportLC WHERE ExportLCID= (SELECT LCID FROM [PI] WHERE PIID=(SELECT PIID FROM Job WHERE JobID=TT.OrderID))),  

    FROM #TempTableOne AS TT 
    WHERE TT.OrderType=3 

しかし、それは可能な更新クエリのようにのような単一のクエリを実行している：私はより速く私のクエリあなたQUERを変更

Answer 1

したいのので

Update #TempTableOne  
    SET SELECT LCID = ISNULL(ExportLCID,0) , 
     LCNo=ISNULL(ExportLCNo,''), 
     AmendmentStatus=AmendmentStatus 
    FROM ExportLC 
    WHERE ExportLCID = (SELECT LCID 
         FROM [PI] 
         WHERE PIID=(SELECT PIID 
            FROM Job 
            WHERE JobID=TT.OrderID 
            ) 
         ) 
       ) 

Update #TempTableOne  
    SET LCID = ISNULL(lc.ExportLCID,0) , 
     LCNo=ISNULL(lc.ExportLCNo,''), 
     AmendmentStatus=lc.AmendmentStatus 
    FROM #TempTableOne tt 
    JOIN Job on Job.JobID = TT.OrderID 
    JOIN [PI] on [PI].PIID = Job.PIID 
    JOIN ExportLC lc on [PI].LCID = lc.ExportLCID