How to get rid of repeated rows? - sql-server-2008

Question

This is the tables structure I have:
1) When I use this query:
SELECT T_ActionTicketLog.ActionTicketID, T_ActionTicketLog.StatusID
--,case when (dbo.T_ActionTicketLog.StatusID <> 2 and dbo.T_ActionTicketLog.StatusID <> 6) then dbo.T_TicketPrint.TicketBarCode
--else null end as TicketBarCode
FROM T_ActionTicketLog
LEFT OUTER JOIN T_OrderTicket ON T_ActionTicketLog.TicketOrderID = T_OrderTicket.ID
--LEFT OUTER JOIN T_TicketPrint ON T_OrderTicket.ActionTicketID = T_TicketPrint.ActionTicketID and T_OrderTicket.ID = T_TicketPrint.OrderTicketID
where T_ActionTicketLog.ActionTicketID = 24014999
Everything works fine and looks as following:
2) But, when I use this query because I need T_TicketPrint.TicketBarCode:
SELECT T_ActionTicketLog.ActionTicketID, T_ActionTicketLog.StatusID
,case when (dbo.T_ActionTicketLog.StatusID <> 2 and dbo.T_ActionTicketLog.StatusID <> 6) then dbo.T_TicketPrint.TicketBarCode
else null end as TicketBarCode
FROM T_ActionTicketLog
LEFT OUTER JOIN T_OrderTicket ON T_ActionTicketLog.TicketOrderID = T_OrderTicket.ID
LEFT OUTER JOIN T_TicketPrint ON T_OrderTicket.ActionTicketID = T_TicketPrint.ActionTicketID and T_OrderTicket.ID = T_TicketPrint.OrderTicketID
where T_ActionTicketLog.ActionTicketID = 24014999
I've got the extra rows and it looks as following:
Here we have the sold tickets in T_TicketPrint table. When the ticket is sold (status 3) it can be printed out (status 10). The important thing is when we print the ticket, every time new bar code is generated. In this case we have a ticket that was sold and printed out 3 times with 3 different bar codes.
The desired result (other values in TicketBarCode column should be NULL):
How to get rid of extra rows?
This is final correct script:
;WITH cte1
AS (SELECT T_ActionTicketLog.ActionTicketID, T_ActionTicketLog.TicketOrderID, T_ActionTicketLog.StatusID, T_ActionTicketLog.Created,
CASE WHEN StatusID IN (3, 10) THEN 1
ELSE 0
END
* ROW_NUMBER() OVER ( PARTITION BY T_ActionTicketLog.ActionTicketID, T_ActionTicketLog.StatusID ORDER BY T_ActionTicketLog.Created ) AS rn
FROM T_ActionTicketLog
LEFT OUTER JOIN T_OrderTicket ON T_ActionTicketLog.TicketOrderID = T_OrderTicket.ID
),
cte2
AS ( SELECT ActionTicketID , OrderTicketID, TicketBarCode,
ROW_NUMBER() OVER ( PARTITION BY ActionTicketID ORDER BY Created ) AS rn
FROM T_TicketPrint
)
SELECT c1.ActionTicketID, c1.StatusID , oa.TicketBarCode
FROM cte1 c1
OUTER APPLY ( SELECT *
FROM cte2 c2
WHERE c1.ActionTicketID = c2.ActionTicketID AND c1.TicketOrderID = c2.OrderTicketID AND c1.rn = c2.rn
) oa
where c1.ActionTicketID = 24014999
order by c1.Created

Answer 1

If I got you right you need to apply to first pair of(3, 10) the first barcode, second barcode to second pair and so on. But it is not clear which of these pairs is first or second.
This is test script:
DECLARE #actions TABLE
(
TicketID INT ,
StatusID INT
)
DECLARE #prints TABLE
(
TicketID INT ,
BarCode NVARCHAR(MAX)
)
INSERT INTO #actions
VALUES ( 1, 2 ),
( 1, 4 ),
( 1, 3 ),
( 1, 10 ),
( 1, 6 ),
( 1, 3 ),
( 1, 10 ),
( 1, 6 ),
( 1, 3 ),
( 1, 10 ),
( 1, 6 ),
( 1, 7 )
INSERT INTO #prints
VALUES ( 1, 'C1' ),
( 1, 'C2' ),
( 1, 'C3' );
WITH cte1
AS ( SELECT * ,
CASE WHEN StatusID IN ( 3, 10 ) THEN 1
ELSE 0
END
* ROW_NUMBER() OVER ( PARTITION BY TicketID, StatusID ORDER BY StatusID ) AS rn
FROM #actions a
),
cte2
AS ( SELECT * ,
ROW_NUMBER() OVER ( PARTITION BY TicketID ORDER BY BarCode ) AS rn
FROM #prints a
)
SELECT c1.TicketID ,
c1.StatusID ,
oa.BarCode
FROM cte1 c1
OUTER APPLY ( SELECT *
FROM cte2 c2
WHERE c1.TicketID = c2.TicketID
AND c1.rn = c2.rn
) oa
Ouptut:
TicketID StatusID BarCode
1 2 NULL
1 3 C1
1 3 C2
1 3 C3
1 4 NULL
1 6 NULL
1 6 NULL
1 6 NULL
1 7 NULL
1 10 C1
1 10 C2
1 10 C3
Something like:
;WITH cte1
AS ( SELECT T_ActionTicketLog.ActionTicketID, T_ActionTicketLog.OrderTicketID, T_ActionTicketLog.StatusID ,
CASE WHEN StatusID IN ( 3, 10 ) THEN 1
ELSE 0
END
* ROW_NUMBER() OVER ( PARTITION BY T_ActionTicketLog.ActionTicketID, T_ActionTicketLog.StatusID ORDER BY T_ActionTicketLog.Created ) AS rn
FROM T_ActionTicketLog
LEFT OUTER JOIN T_OrderTicket ON T_ActionTicketLog.TicketOrderID = T_OrderTicket.ID
),
cte2
AS ( SELECT ActionTicketID , OrderTicketID, TicketBarCode
ROW_NUMBER() OVER ( PARTITION BY ActionTicketID ORDER BY Created ) AS rn
FROM T_TicketPrint
)
SELECT c1.ActionTicketID, c1.StatusID , oa.TicketBarCode
FROM cte1 c1
OUTER APPLY ( SELECT *
FROM cte2 c2
WHERE c1.ActionTicketID = c2.ActionTicketID AND c1.ID = c2.OrderTicketID AND c1.rn = c2.rn
) oa