Conditional INSERT INTO statement in postgres

Question

I\'m writing a booking procedure for a mock airline booking database and what I really want to do is something like this:

IF EXISTS (SELECT * FROM LeadCustom         


        

Answer 1

As of 9.5 version of pgsql upsert is included, using INSERT ... ON CONFLICT DO UPDATE ...

The answer below is no longer relevant. Postgres 9.5 was released a couple years later with a better solution.

Postgres doesn't have "upsert" functionality without adding new functions.
What you'll have to do is run the select query and see if you have matching rows. If you do, then insert it.

I know you're not wanting an upsert exactly, but it's pretty much the same.