The catalog pg_auth_members shows the membership relations between roles. Any non-circular set of relationships is allowed.

The catalog pg_range stores information about range types. This is in addition to the types' entries in

Table 50-1 lists the system catalogs. More detailed documentation of each catalog follows below. Most system catalogs are copied from the template

The catalog pg_operator stores information about operators. See CREATE

The view pg_settings provides access to run-time parameters of the server. It is essentially an alternative interface to the

The catalog pg_namespace stores namespaces. A namespace is the structure underlying SQL schemas: each namespace can have a separate collection

The view pg_tables provides access to useful information about each table in the database.

The catalog pg_collation describes the available collations, which are essentially mappings from an SQL name to operating system locale categories

The catalog pg_transform stores information about transforms, which are a mechanism to adapt data types to procedural languages. See

The catalog pg_aggregate stores information about aggregate functions. An aggregate function is a function that operates on a set of values