LEFT OUTER JOIN e NOT EXISTS query

Question

Sto attraversando un periodo di difficoltà con un join complesso, in cui è necessario unire due volte le stesse due tabelle e assicurarsi che l'unione venga eseguita ogni volta solo con un record specifico (il più recente).

SELECT c.collection_id  AS collections, 
     s.strat_id   AS StrategyId, 
     s.strat_version  AS StrategyVersion, 
     ssb.side_ordering AS SSB_SO, 
     ssb2.side_ordering AS SSB2_SO, 
     Invoice1.invoice_id AS Inv1ID, 
     Invoice2.invoice_id AS Inv2ID, 
     Invoice1.printeddate AS Inv1PrintedDate, 
     Invoice2.printeddate AS Inv2PrintedDate 
    FROM dbo.collections AS c 
     INNER JOIN dbo.strategies AS s 
       ON c.collection_id = s.collection_id 
     INNER JOIN dbo.side_strat_brkrgs AS ssb 
       ON s.collection_id = ssb.collection_id 
        AND s.strat_id = ssb.strat_id 
        AND s.strat_version = ssb.strat_version 
     INNER JOIN dbo.strat_sides AS ss 
       ON ss.strat_side_id = ssb.strat_side_id 
     LEFT OUTER JOIN dbo.side_strat_brkrgs AS ssb2 
        ON ssb2.collection_id = ssb.collection_id 
         AND ssb2.strat_id = ssb.strat_id 
         AND ssb2.strat_version = ssb.strat_version 
         AND ssb2.side_ordering <> ssb.side_ordering 
     INNER JOIN dbo.strat_sides AS ss2 
       ON ss2.strat_side_id = ssb2.strat_side_id 
     LEFT OUTER JOIN dbo.newinvoiceitem AS InvoiceItem1 
        ON ssb.collection_id = InvoiceItem1.collection_id 
         AND ssb.side_ordering = InvoiceItem1.side_ordering 
         AND s.strat_id = InvoiceItem1.strat_id 
     LEFT OUTER JOIN dbo.newinvoice AS Invoice1 
        ON Invoice1.invoice_id = InvoiceItem1.invoice_id 
     LEFT OUTER JOIN dbo.newinvoiceitem AS InvoiceItem2 
        ON ssb2.collection_id = InvoiceItem2.collection_id 
         AND ssb2.side_ordering = InvoiceItem2.side_ordering 
         AND s.strat_id = InvoiceItem2.strat_id 
     LEFT OUTER JOIN dbo.newinvoice AS Invoice2 
        ON Invoice2.invoice_id = InvoiceItem2.invoice_id 
WHERE NOT EXISTS (SELECT 1 
        FROM dbo.newinvoiceitem tempInvoiceItem1 
          INNER JOIN dbo.newinvoice AS tempInvoice1 
            ON tempInvoice1.invoice_id = 
            tempInvoiceItem1.invoice_id 
        WHERE tempInvoiceItem1.collection_id = ssb.collection_id 
          AND ssb.side_ordering = tempInvoiceItem1.side_ordering 
          AND s.strat_id = tempInvoiceItem1.strat_id 
          AND s.strat_version = tempInvoiceItem1.strat_version 
          AND tempInvoice1.printeddate > Invoice1.printeddate) 
     AND NOT EXISTS (SELECT 1 
         FROM dbo.newinvoiceitem tempInvoiceItem2 
           INNER JOIN dbo.newinvoice AS tempInvoice2 
             ON tempInvoice2.invoice_id = 
             tempInvoiceItem2.invoice_id 
         WHERE 
       tempInvoiceItem2.collection_id = ssb2.collection_id 
       AND ssb2.side_ordering = tempInvoiceItem2.side_ordering 
       AND s.strat_id = tempInvoiceItem2.strat_id 
       AND s.strat_version = tempInvoiceItem2.strat_version 
       AND tempInvoice2.printeddate > Invoice2.printeddate) 
     AND c.collection_id = 16447 

io ottenere il seguente risultato:

16447 1 3 1 0 3785 3183 2010-05-06 17:52:00 2010-05-06 17:52:00 
16447 1 3 1 0 3785 4033 2010-05-06 17:52:00 2010-05-10 16:32:00 
16447 1 3 1 0 4137 3183 2010-05-20 17:08:00 2010-05-06 17:52:00 
16447 1 3 1 0 4137 4033 2010-05-20 17:08:00 2010-05-10 16:32:00 

Mentre sto in realtà aspettavo solo l'ultima riga. Dove mi sbaglio?

Come vedi non posso utilizzerò MAX() per recuperare il più alto record, perché ho bisogno di cercare un'altra proprietà attraverso un JOIN, e sono costretto a utilizzare un inesistente

Answer 1

Prova questo predicato

WHERE EXISTS (SELECT 1 
       FROM dbo.newinvoiceitem tempInvoiceItem1 
       INNER JOIN dbo.newinvoice AS tempInvoice1 
        ON tempInvoice1.invoice_id = tempInvoiceItem1.invoice_id 
       WHERE tempInvoiceItem1.collection_id = ssb.collection_id 
       AND ssb.side_ordering = tempInvoiceItem1.side_ordering 
       AND s.strat_id = tempInvoiceItem1.strat_id 
       HAVING MAX(tempInvoice1.printeddate) = Invoice1.printeddate 
       OR Invoice1.printeddate IS NULL 
       )       
     AND EXISTS (SELECT 1 
        FROM dbo.newinvoiceitem tempInvoiceItem2 
        INNER JOIN dbo.newinvoice AS tempInvoice2 
         ON tempInvoice2.invoice_id = tempInvoiceItem2.invoice_id 
        WHERE tempInvoiceItem2.collection_id = ssb2.collection_id 
        AND ssb2.side_ordering = tempInvoiceItem2.side_ordering 
        AND s.strat_id = tempInvoiceItem2.strat_id 
        HAVING MAX(tempInvoice2.printeddate) = Invoice2.printeddate 
        OR Invoice2.printeddate IS NULL 
        ) 
     AND c.collection_id = 16447 

O

WHERE EXISTS (SELECT 1 
       FROM dbo.newinvoiceitem tempInvoiceItem1 
       INNER JOIN dbo.newinvoice AS tempInvoice1 
        ON tempInvoice1.invoice_id = tempInvoiceItem1.invoice_id 
       WHERE tempInvoiceItem1.collection_id = ssb.collection_id 
       AND ssb.side_ordering = tempInvoiceItem1.side_ordering 
       AND s.strat_id = tempInvoiceItem1.strat_id 
       HAVING MAX(tempInvoice1.printeddate) = Invoice1.printeddate      
       )       
     AND EXISTS (SELECT 1 
        FROM dbo.newinvoiceitem tempInvoiceItem2 
        INNER JOIN dbo.newinvoice AS tempInvoice2 
         ON tempInvoice2.invoice_id = tempInvoiceItem2.invoice_id 
        WHERE tempInvoiceItem2.collection_id = ssb2.collection_id 
        AND ssb2.side_ordering = tempInvoiceItem2.side_ordering 
        AND s.strat_id = tempInvoiceItem2.strat_id 
        HAVING MAX(tempInvoice2.printeddate) = Invoice2.printeddate 
        ) 
     AND c.collection_id = 16447 OR Invoice1.printeddate IS NULL 
     OR Invoice2.printeddate IS NULL