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Delete duplicate records using SQL in iSeries 400

Get rid of duplicate records in a file by using a simple SQL statement.

This tip is useful in getting rid of duplicate records in a file. Instead of writing a RPG pgm, users can just accomplish it using a simple SQL statement. However, I advice people to be judicious in using it based on file size. The SQL performance may not be as good as the native file access.

Delete from File1 F1 where RRN(f1) > (select MIN(RRN(F2)) from File1 F2 where F2.Field1 = F1.Field1)

If there is more than one field as key add them as part of the WHERE clause. Note that F1 and F2 are pointing to the same file.

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