When we create a pk in PostgreSQL, an index named table_name_pkey is automatically created.
The following script gives all indexes, those created by the pk and the others.
Don’t forget that PostgreSQL does not create automatically an index when you create a fk. You have to do it yourself !
By the way, this script works for indexes on multiple columns thank the handy function array_to_string that makes a concatenation of the column names. It works because the two first fields selected are given in the order by.
select t.relname as table_name i.relname as index_name ,array_to_string(array_agg(a.attname), ', ') as column_names from pg_class t ,pg_class i ,pg_index ix ,pg_attribute a where t.oid = ix.indrelid and i.oid = ix.indexrelid and a.attrelid = t.oid and a.attnum = any(ix.indkey) and t.relkind = 'r' -- takes regular tables and t.relname not like 'pg_%' -- exclude system catalogs group by t.relname ,i.relname order by t.relname ,i.relname;