Check if table inherits from other table in PostgreSQL

Question

In PostgreSQL for these tables

CREATE TABLE cities (
    name            text,
    population      float,
    altitude        int     -- in feet
);

CREATE T         


        

Answer 1

The following statement will retrieve the tables that cities inherits from. If the table does not inherit from another table, the result will be empty:

select bt.relname as table_name, bns.nspname as table_schema 
from pg_class ct 
    join pg_namespace cns on ct.relnamespace = cns.oid and cns.nspname = 'public' 
    join pg_inherits i on i.inhrelid = ct.oid and ct.relname = 'cities ' 
    join pg_class bt on i.inhparent = bt.oid 
    join pg_namespace bns on bt.relnamespace = bns.oid