Question

alt text http://img187.imageshack.us/img187/8453/testhc3.png

alt text http://img145.imageshack.us/img145/3306/test2bn4.png

The first picture is my query. I need to obtain results in second picture.

select OrarioA, OrarioB, MAX(VW_DettaglioOrariLinee_FromAToB.IDOrario), dbo.VW_DettaglioOrariLinee_FromAToB.IDDettaglioOrarioA, dbo.VW_DettaglioOrariLinee_FromAToB.IDDettaglioOrarioB FROM         dbo.VW_DettaglioOrariLinee_FromAToB INNER JOIN                       Tb_Linee ON dbo.VW_DettaglioOrariLinee_FromAToB.IDRelA = Tb_Linee.IDRelA AND                        dbo.VW_DettaglioOrariLinee_FromAToB.IDRelB = Tb_Linee.IDRelB INNER JOIN                       dbo.periodi ON dbo.VW_DettaglioOrariLinee_FromAToB.IDOrario = dbo.periodi.IDOrario INNER JOIN                       dbo.relgiornisettimanaorarilinee ON dbo.VW_DettaglioOrariLinee_FromAToB.IDOrario = dbo.relgiornisettimanaorarilinee.IDOrario 

This is my real query:

WITH Tb_Linee AS (     SELECT * FROM VW_rellineestazionamenti      WHERE      IDLINEA = @IDLINEA      AND      IDStazA = @IDStazA      AND     IDStazB = @IDStazB      AND     PosizioneA = @PosizioneA     AND     PosizioneB = @PosizioneB )   select OrarioA, OrarioB, VW_DettaglioOrariLinee_FromAToB.IDOrario, dbo.VW_DettaglioOrariLinee_FromAToB.IDDettaglioOrarioA, dbo.VW_DettaglioOrariLinee_FromAToB.IDDettaglioOrarioB FROM         dbo.VW_DettaglioOrariLinee_FromAToB INNER JOIN                       Tb_Linee ON dbo.VW_DettaglioOrariLinee_FromAToB.IDRelA = Tb_Linee.IDRelA AND                        dbo.VW_DettaglioOrariLinee_FromAToB.IDRelB = Tb_Linee.IDRelB INNER JOIN                       dbo.periodi ON dbo.VW_DettaglioOrariLinee_FromAToB.IDOrario = dbo.periodi.IDOrario INNER JOIN                       dbo.relgiornisettimanaorarilinee ON dbo.VW_DettaglioOrariLinee_FromAToB.IDOrario = dbo.relgiornisettimanaorarilinee.IDOrario 

Answer 1

If you want to partition by OrarioA only:

SELECT OrarioA, OrarioB, IDOrario, IDDettaglioOrarioA, IDDettaglioOrarioB FROM (   SELECT *, ROW_NUMBER() OVER (PARTITION BY OrarioA ORDER BY OrarioB DESC, IDOrario DESC) AS rn   FROM table   ) t WHERE rn = 1 

, this will result in the resultset as on picture 2.

If you want to partition by OrarioA and OrarioB:

SELECT OrarioA, OrarioB, IDOrario, IDDettaglioOrarioA, IDDettaglioOrarioB FROM (   SELECT *, ROW_NUMBER() OVER (PARTITION BY OrarioA, OrarioB ORDER BY IDOrario DESC) AS rn   FROM table   ) t WHERE rn = 1 

, but this won’t filter out the first row in your resultset.