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lucas@presserv.org wrote:
> Thanks....
> CTAS (Create Table As Select) command works fine!!! With great performance.
> I think it is the best way to correct the data...(apparently)
> I didnt know about "select DISTINCT". I am going to read about it.
You might want to wrap this in some locking and throw in some
constraints to avoid dupes in the future...
BEGIN;
LOCK lanctos IN ACCESS EXCLUSIVE;
CREATE TABLE lanctos_distinct AS SELECT DISTINCT * FROM lanctos;
DROP TABLE lanctos;
ALTER TABLE lanctos_distinct RENAME TO lanctos;
ALTER TABLE lanctos ALTER id SET NOT NULL;
CREATE UNIQUE INDEX lanctos_id_idx ON lanctos (id);
ALTER TABLE lanctos ADD CONSTRAINT lanctos_id_pkey PRIMARY KEY (id);
COMMIT;
As always, don't forget to ANALYZE the new table.
- --
Andrew Hammond 416-673-4138 ahammond@ca.afilias.info
Database Administrator, Afilias Canada Corp.
CB83 2838 4B67 D40F D086 3568 81FC E7E5 27AF 4A9A
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