Does Redshift support any statement equivalent to the following?
DROP TABLE IF EXISTS tablename
2 Answers
This is supported in the latest version of Redshift:
DROP TABLE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]
IF EXISTS Clause that indicates that if the specified table doesn’t exist, the command should make no changes and return a message that the table doesn't exist, rather than terminating with an error.
This clause is useful when scripting, so the script doesn’t fail if DROP TABLE runs against a nonexistent table.
Taken from online AWS Redshift docs.
See next answer; this is out of date.
Support for
DROP TABLE IF EXISTS tablename;
was added in PostgreSQL 8.2. Redshift is a very heavily modified fork of 8.1 by ParAccel, and as far as I know they've backported very few changes from newer versions. It's very unlikely that it supports IF EXISTS; you probably need to do a catalog query to determine if the table exists by looking up information_schema, then deciding whether you'll create it based on the result.
