The pg_partition_rule system catalog table is used to track partitioned tables, their check constraints, and data containment rules. Each row of pg_partition_rule represents either a leaf partition (the bottom level partitions that contain data), or a branch partition (a top or mid-level partition that is used to define the partition hierarchy, but does not contain any data).

column	type	references	description
paroid	oid	pg_partition.oid	Row identifier of the partitioning level (from pg_partition) to which this partition belongs. In the case of a branch partition, the corresponding table (identified by pg_partition_rule) is an empty container table. In case of a leaf partition, the table contains the rows for that partition containment rule.
parchildrelid	oid	pg_class.oid	The table identifier of the partition (child table).
parparentrule	oid	pg_partition_rule.paroid	The row identifier of the rule associated with the parent table of this partition.
parname	name		The given name of this partition.
parisdefault	boolean		Whether or not this partition is a default partition.
parruleord	smallint		For range partitioned tables, the rank of this partition on this level of the partition hierarchy.
parrangestartincl	boolean		For range partitioned tables, whether or not the starting value is inclusive.
parrangeendincl	boolean		For range partitioned tables, whether or not the ending value is inclusive.
parrangestart	text		For range partitioned tables, the starting value of the range.
parrangeend	text		For range partitioned tables, the ending value of the range.
parrangeevery	text		For range partitioned tables, the interval value of the EVERY clause.
parlistvalues	text		For list partitioned tables, the list of values assigned to this partition.
parreloptions	text		An array describing the storage characteristics of the particular partition.

Parent topic: System Catalogs Definitions