CREATE UNIQUE INDEX IF NOT EXISTS in postgreSQL

Question

Plese I would like to do in PostgreSQL something like

CREATE UNIQUE INDEX IF NOT EXISTS

Any idea?

Answer 1

If you are still stuck in previous versions, I would recommend not using count, but just the query directly in your if condition. Makes the code simpler. You can try something like this:

do 
$$
begin
if not exists (
    select indexname
        from pg_indexes
    where schemaname = 'schemaname'
        and tablename = 'tablename'
        and indexname = 'indexname'
)
then
    create unique indexname (...);
end if;
end 
$$;