Re: delete non-unique

Similar to other suggestion:

BEGIN;
SELECT DISTINCT ON (col1) * INTO TEMP unique_rows FROM table1;
COPY unique_rows TO '/tmp/unique.sql';
TRUNCATE TABLE table1;
COPY table1 FROM '/tmp/unique.sql';
COMMIT;

On Wed, 2007-04-25 at 13:08 +0400, henlin wrote:

> i need to clean up some tables: from several equal rows keep only one
> (like `sort -u`)
>
> aaa bbb - do not delete
> aaa bbb - delete
> aaa bbb - delete

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