How about:
UPDATE table_name SET column1 = NULL, column2 = NULL, column3 = NULL
> -----Original Message-----
> From: pgsql-admin-owner@postgresql.org
> [mailto:pgsql-admin-owner@postgresql.org] On Behalf Of smiley2211
> Sent: Thursday, August 09, 2007 10:27 AM
> To: pgsql-admin@postgresql.org
> Subject: [ADMIN] Delete COLUMN data
>
>
> Hello all,
>
> I need to DELETE all the DATA from 3 columns in my
> table...what is the BEST way to handle this??? I don't want
> to DROP the columns just clear out ALL the data in those 3 fields...
>
> Thanks...Michelle
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> Sent from the PostgreSQL - admin mailing list archive at Nabble.com.
>
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> TIP 9: In versions below 8.0, the planner will ignore your desire to
> choose an index scan if your joining column's datatypes do not
> match
>
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