<william.a.dean@gdc4s.com> writes:
> The sql statement 'ALTER TABLE <table name> DROP CONSTRAINT IF EXISTS
> <constraint-name>' returns with a syntax error on exists. The
> documentation states that the IF EXISTS clause is allowed in DROP
> CONSTRAINT statements.
Apparently you're reading 9.0 documentation and using a pre-9.0 server.
Please see the manual appropriate to your PG version.
regards, tom lane
