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SQL Server 2008: Query logic using CTE

Hello,

I've a staging table in which I've many rows with respect to booking number.

So, can I do in a single query using CTE to find out below concern? FYI, one way I can use cursor or some iterative loop. But I would like to use in single query using CTE.

--> as per below tables records, booking # 101, A needs to pay $3000 to B; So, first A paid to E = 1000 and A paid to C = 2000 (so that E & C now responsible to pay B).
So, E, C, D, F, X, Y, and Z all our mediator.

Below thing I need to achieve from this table:

1. How many mediator used in this booking and the amount they received from source point; actually they paid all amount to other mediator like A to E 1000 so, from E, it should be paid to other like D & F 500. It is same for C, X, Y & Z?

2. The amount should be delivered completely for each mediator i.e. it should not D = 500 and F = 490.

For e.g., (also, please find attached .png file here)
Note: Booking #, Source & Destination will be duplicate.

Booking#	Source	Destination	Mid Source	Mid Destination	Payment ($)
101	A	B	A	E	1000
101	A	B	A	C	2000
101	A	B	E	D	500
101	A	B	E	F	500
101	A	B	C	X	1000
101	A	B	C	Y	700
101	A	B	C	Z	300
101	A	B	X	B	1000
101	A	B	Y	B	700
101	A	B	Z	B	300

Best Regards,
Mohit Pandit
001-Snap.PNG
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Saurabh Bhadauria
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Can you post here what output you required.  ?  

I mean a  sample output dataset  as per above data.... and also some more explanation....
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Should there not also be these two rows?
101      A      B      D      B      500
101      A      B      F      B      500
Need more explanation...
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ASKER

I need to put validations either respective booking is valid or not i.e. A needs to pay $3000 to B and the amount mediator receives then the same amount should travel to other mediator and at last the destination i.e. B.

Let's take A (source) paid E (mediator) 1000 then E paid to D & F (mediator) 500 each.
--> in that case E receives 1000 and same amount he paid to E & D i.e. 500 each.
I apologize, two more records should be in table; added in below table in last (marked with *).

Booking#      Source      Destination      Mid Source      Mid Destination      Payment ($)
101      A      B      A      E      1000
101      A      B      A      C      2000
101      A      B      E      D      500
101      A      B      E      F      500
101      A      B      C      X      1000
101      A      B      C      Y      700
101      A      B      C      Z      300
101      A      B      X      B      1000
101      A      B      Y      B      700
101      A      B      Z      B      300
101      A      B      D      B      500 *
101      A      B      F       B      500 *

Similar A paid to C and C paid to X,Y, & Z and X,Y and Z paid to B. So, I need to put validations the amount given by source/mid source then it should be same travel at destination/mid destination otherwise I need to put an alert to end user.

I hope, it should clear now. Kindly let me know in case still not clear.
Check below code... below query can solve your problem.. you can write it in your way...
even you can use CTE if you are working with multiple sources and destinations...

Declare @ta table (Booking int,    Source      char(2)  , Destination   char(2)  ,    [Mid Source]     char(2)  ,  [Mid Destination]   char(2)  ,  Payment int)

insert into @ta 
select 101 ,      'A'      ,'B',      'A'     , 'E'      ,1000
union all select 101 ,      'A'      ,'B',      'A'      ,'C'     , 2000
union all select 101 ,      'A'      ,'B',      'E'      ,'D'    ,  500
union all select 101 ,      'A'      ,'B',      'E'      ,'F'   ,   500
union all select 101 ,      'A'      ,'B',      'C'      ,'X'  ,    1000
union all select 101 ,      'A'      ,'B',      'C'      ,'Y' ,     700
union all select 101 ,      'A'      ,'B',      'C'      ,'Z',      300
union all select 101 ,      'A'      ,'B',      'X'      ,'B',      1000
union all select 101 ,      'A'      ,'B',      'Y'      ,'B',      700
union all select 101 ,      'A'      ,'B',      'Z'      ,'B',      300
union all select 101 ,      'A'      ,'B',      'D'      ,'B',      500 
union all select 101 ,      'A'      ,'B',      'F'       ,'B',      50

select * from @ta

select t.*, case when x.payment<>t.Payment then 'Payment Mistmatch ' else '' end  as [status] from @ta t join 
(select booking,Source,Destination,[Mid Source] , SUM(Payment) as payment from @ta 
group by booking,Source,Destination,[Mid Source]) x
on t.Booking=x.booking and t.Source=x.Source  and  t.Destination=x.Destination and t.[Mid Destination]=x.[Mid Source]

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Sauv,

I had prepared something similar. It might suffice, but for one point - if a transaction is completely missing, it does not appear. E.g. if E made no transfer, A -> E with 1000 will not appear. Using a Left Join (and applying isnull to x.payment) should help.
Additionally I would also output the missing amount.
Hi Saurv,

I checked the code and looks good. Actually, I can have 30k records in a file so it would good if we will use CTE. Could you please share your thoughts?

I also noted Qlemo point for using LEFT OUTER JOIN.

Thanks

Best Regards,
Mohit Pandit
Your original request is still not clear. If you have 30k records, what do you expect as output from them? Are interested in just in something like
Booking	Source	Dest	Total	Remaining	NoMediators
101	A	B	3000	0		7

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and then need a query to drill-down to the mediators not having distributed the received money?
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Saurabh Bhadauria
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Hi Saurv,

I'll take a look over it and let you update after that.
Thanks

Best Regards,
Mohit Sharma
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Thank you very much mark_wills for sharing your great thoughts. I'll try to dig it and let you update after that.
Thanks again!
Excellent!