The following bug has been logged online:
Bug reference: 2403
Logged by: Harry E. Clarke
Email address: Harry.Clarke@metrosky.co.uk
PostgreSQL version: 8.1.3
Operating system: Suse Linux 10.0
Description: Date arithemtic using INTERVAL in UPDATE command does
not work
Details:
Entering the command
UPDATE table SET col_date = col_date - INTERVAL '100' YEAR where condition;
does not perform any date aritimetic, and thus the date value in col_date
remains unchanged. col_date contains a value such as '2039-12-07'. If the
command
UPDATE table SET col_date = DATE '1939-12-07' where condition;
is entered, the command executes as expected.