David, Thank you for your prompt reply. I believe your answer helped a lot but it seems I was not clear enough on my description. Basically I want a counter (id) to show if two or more names are similar (i.e. levenshtein distance less than 3) So in the previous example: >From this table: Name, City "Booob", "NYC" "Alex", "Washington" "Alexj2", "Washington" "Bob", "NYC" "Aleex1", "Washington" to get this table: id, Name, City 1,"Alex", "Washington" 1,"Aleex1", "Washington" 1,"Alexj2", "Washington" 2,"Bob", "NYC" 2,"Booob", "NYC" So basically the id is a counter that starts from "1" and increments only when there is a different name. Please notice that the table has its names in a completely random order. -- View this message in context: http://postgresql.nabble.com/Merge-rows-based-on-Levenshtein-distance-tp5828841p5829030.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
