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Asked: 2026-05-31T05:35:53+00:00

I need to write an update script that will check to see if certain

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I need to write an update script that will check to see if certain tables, indexes, etc. exist in the database, and if not, create them. I’ve been unable to figure out how to do these checks, as I keep getting Syntax Error at IF messages when I type them into a query window in PgAdmin.

Do I have to do something like write a stored procedure in the public schema that does these updates using Pl/pgSQL and execute it to make the updates? Hopefully, I can just write a script that I can run without creating extra database objects to get the job done.

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  1. Editorial Team

    If you are on PostgreSQL 9.1, you can use CREATE TABLE ... IF NOT EXISTS

    On 9.0 you can wrap your IF condition code into a DO block: http://www.postgresql.org/docs/current/static/sql-do.html

    For anything before that, you will have to write a function to achieve what you want.

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