adding default values doesn't work

Hi. I'm running Postgres 6.5.3 and want to add a column with
"default 0" to an existing table.

alter table <table> add column col int4 default 0;

does not work. I've also tried modifying the system table,
pg_attrdef, but that does not work either. I don't want to drop
and recreate the table.

Any ideas anyone?

thanks!

-Kevin

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