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06.07.2008 at 08:26AM PDT, ID: 23466141
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9.3

Remove "reciprocal duplicates" via TSQL (SQL Server 2005)

Asked by dkDeveloper in SQL Server 2005

I have very simple table that relates a customer (CIF) to an account.  

CIF     Account
-------------------
1         x
2         x
3         x
4         y
5         y

From this table I want to derive relationships between customers.

CIF1   CIF2
1          2
1          3
2          3
4          5

Currently I am tying the table together with a statement something like this...

SELECT DISTINCT CIF1, CIF2
  FROM customer_account tbl1,
              customer_account tbl2
  WHERE tbl1.account_no = tbl2.account_no
       AND cif1 <> cif2

This gets me the information I need... and then some.  This will return a result set similar to this...


CIF1   CIF2
1          2
1          3
2          3
4          5
2          1
3          1
3          2
5          4

... which techinically isn't duplicated, but from a business logic standpoint, its a representation of the same relationships twice.

Anyone have any idea how to grab the distinct relationships here?

TIA,
dKStart Free Trial
[+][-]06.07.2008 at 10:39AM PDT, ID: 21736258

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About this solution

Zone: SQL Server 2005
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Solution Provided By: fesnyng
Participating Experts: 1
Solution Grade: A
 
 
 
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