Question

I need a script to find Member who has a friend connection more than once so it doesn’t show their friendship more than once on the website.

The MemberConnection table is as follows:

+----------------------+------------+----------------+
|  MemberConnectionID  |  MemberID  |  ConnMemberID  |
+----------------------+------------+----------------+
|  25                  |  33        | 43             |
|  26                  |  43        | 33             |
|  27                  |  13        | 143            |
|  28                  |  143       | 13             |
|  29                  |  33        | 43             |
+----------------------+------------+----------------+

As you can see rows 25 and 29 are identical and I need to find these duplicates so they can be deleted.

How can I write a script for this?

Any help that anyone can provide would be greatly appreciated.

Many thanks in advance

neojakey

Answer 1

Try this if you want to leave one connection:

Use this to select connections:

;WITH CTE
AS
(
   SELECT
      MemberConnectionID, 
      ROW_NUMBER() OVER (PARTITION BY MemberID, ConnMemberID ORDER BY MemberConnectionID) RN
   FROM MemberConnection 
)
SELECT 
      MemberConnectionID
FROM CTE
WHERE RN > 1

or use this to delete from table:

;WITH CTE
AS
(
   SELECT
      ROW_NUMBER() OVER (PARTITION BY MemberID, ConnMemberID ORDER BY MemberConnectionID) RN
   FROM MemberConnection 
)
DELETE
FROM CTE
WHERE RN > 1