SQL Query Syntax Help need guru

Hello all,

This is what I am trying to do even if I can get a start at this query it will be a help.   I have a set of data from a query such as this:

CustomerCT
OpId     SeqId       Operation      CustName      CustGroup     CustLocation
1            1              1                     ABC Corp       C                     Denver
1            2              2                     ABC Corp       C                     Null
1            3              3                     ABC Corp       C                     Null
1            4              4                     ABC Corp       C                     Denver
2            1              3                     HI Corp          D                     Boston
2            2              4                     HI Corp          E                      Boston
3            1              2                     New Up         A                     Chicago
4            1              2                     Test Co          C                     New Orleans
4            2              1                     Test Co          D                     New Orleans

I want to get the last SeqId record for each grouped OpId set into one result set.    If the last seq id record operation is = 1 then I I want to return NULL for all the values.
sbornstein2Asked:
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Try this one:
WITH SeqID_CTE (OpId, MaxSeqId) AS
(
	SELECT OpID, MAX(SeqID)
	FROM CustomerCT
	GROUP BY OpID
)
SELECT C.OpId, CASE C.SeqId
		WHEN 1 THEN NULL
		ELSE C.SeqId
	END, C.Operation. C.CustName, C.CustGroup, C.CustLocation
FROM CustomerCT C
	INNER JOIN SeqID_CTE S ON S.OpId = C.OpId AND S.MaxSeqId = C.SeqId

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ste5anSenior DeveloperCommented:
I want to get the last SeqId record for each grouped OpId set into one result set.    If the last seq id record operation is = 1 then I I want to return NULL for all the values.
How should your result look like?

DECLARE @CustomerCT TABLE
    (
      OpId INT ,
      SeqId INT ,
      Operation INT ,
      CustName NVARCHAR(255) ,
      CustGroup NVARCHAR(255) ,
      CustLocation NVARCHAR(255)
    );
 
INSERT  INTO @CustomerCT
VALUES  ( 1, 1, 1, 'ABC Corp', 'C', 'Denver' ),
        ( 1, 2, 2, 'ABC Corp', 'C', NULL ),
        ( 1, 3, 3, 'ABC Corp', 'C', NULL ),
        ( 1, 4, 4, 'ABC Corp', 'C', 'Denver' ),
        ( 2, 1, 3, 'HI Corp', 'D', 'Boston' ),
        ( 2, 2, 4, 'HI Corp', 'E', 'Boston' ),
        ( 3, 1, 2, 'New Up', 'A', 'Chicago' ),
        ( 4, 1, 2, 'Test Co ', 'C', 'New Orleans' ),
        ( 4, 2, 1, 'Test Co ', 'D', 'New Orleans' );

WITH    Ordered
          AS ( SELECT   * ,
                        ROW_NUMBER() OVER ( PARTITION BY CC.OpId ORDER BY CC.SeqId DESC ) AS RN
               FROM     @CustomerCT CC
             )
    SELECT  IIF(O.SeqId = 1, NULL, O.OpId) AS OpId ,
            IIF(O.SeqId = 1, NULL, O.SeqId) AS SeqId ,
            IIF(O.SeqId = 1, NULL, O.Operation) AS Operation ,
            IIF(O.SeqId = 1, NULL, O.CustName) AS CustName ,
            IIF(O.SeqId = 1, NULL, O.CustGroup) AS CustGroup ,
            IIF(O.SeqId = 1, NULL, O.CustLocation) AS CustLocation
    FROM    Ordered O
    WHERE   RN = 1;

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sbornstein2Author Commented:
I actually have to do one more thing.  I am going to have two more columns UpdCustName and UpdCustGroup that will be bits 0 or 1 always.  If the max sequence for the grouped OpId operation = 4 then i need to check if both columns are set to 0 if so ignore that record and not have it in the resultset.   Only if that max seq operation = 4 I need to check if both those flag fields are zero then ignore it.
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ste5anSenior DeveloperCommented:
DECLARE @CustomerCT TABLE
    (
      OpId INT ,
      SeqId INT ,
      Operation INT ,
      CustName NVARCHAR(255) ,
      CustGroup NVARCHAR(255) ,
      CustLocation NVARCHAR(255) ,
      UpdCustName BIT ,
      UpdCustGroup BIT
    );
 
INSERT  INTO @CustomerCT
VALUES  ( 1, 1, 1, 'ABC Corp', 'C', 'Denver', 0, 0 ),
        ( 1, 2, 2, 'ABC Corp', 'C', NULL, 0, 0 ),
        ( 1, 3, 3, 'ABC Corp', 'C', NULL, 0, 0 ),
        ( 1, 4, 4, 'ABC Corp', 'C', 'Denver', 0, 0 ),
        ( 2, 1, 3, 'HI Corp', 'D', 'Boston', 0, 0 ),
        ( 2, 2, 4, 'HI Corp', 'E', 'Boston', 0, 0 ),
        ( 3, 1, 2, 'New Up', 'A', 'Chicago', 0, 0 ),
        ( 4, 1, 2, 'Test Co ', 'C', 'New Orleans', 0, 0 ),
        ( 4, 2, 1, 'Test Co ', 'D', 'New Orleans', 0, 0 );

WITH    Ordered
          AS ( SELECT   * ,
                        ROW_NUMBER() OVER ( PARTITION BY CC.OpId ORDER BY CC.SeqId DESC ) AS RN
               FROM     @CustomerCT CC
             )
    SELECT  IIF(O.SeqId = 1, NULL, O.OpId) AS OpId ,
            IIF(O.SeqId = 1, NULL, O.SeqId) AS SeqId ,
            IIF(O.SeqId = 1, NULL, O.Operation) AS Operation ,
            IIF(O.SeqId = 1, NULL, O.CustName) AS CustName ,
            IIF(O.SeqId = 1, NULL, O.CustGroup) AS CustGroup ,
            IIF(O.SeqId = 1, NULL, O.CustLocation) AS CustLocation
    FROM    Ordered O
    WHERE   O.RN = 1
            AND ( O.SeqId != 4
                  OR ( O.SeqId = 4
                       AND O.UpdCustName != 0
                       AND O.UpdCustGroup != 0
                     )
                );

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sbornstein2Author Commented:
Thanks ste5 I will try that as soon as I get into the office.  This was a tough one for me I knew it would need a partition.   I will try when I get in shortly.  Thanks so much for the assist.
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sbornstein2Author Commented:
This is perfect thanks so much ste5
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sbornstein2Author Commented:
Hey ste5 this may be difficult but is there anyway to handle this scenario?  No idea how to handle this it may be difficult   If the max record is operation = 2 and the previous seq operation = 1 then if custname and custgroup are the same values I want to ignore it.   I know insane ;).
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ste5anSenior DeveloperCommented:
Well, can you post sample data and the desired output?
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