SYSTEM CATALOG · System catalog

pg_partitioned_table

PostgreSQL documentation ↗Source definition ↗

The catalog pg_partitioned_table stores information about how tables are partitioned.

First seen PG 10Last seen PG 19Columns 8

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

Checked column by column against a PostgreSQL 18.6 instance · Raw measurement record ↗

Columns PostgreSQL 18

pg_partitioned_table

COLUMN	TYPE	DESCRIPTION
`partrelid`	`oid`NOT NULL	The OID of the pg_class entry for this partitioned tableReferences:`pg_class.oid`
`partstrat`	`"char"`NOT NULLDocumented as:`char`	Partitioning strategy; h = hash partitioned table, l = list partitioned table, r = range partitioned table
`partnatts`	`smallint`NOT NULLDocumented as:`int2`	The number of columns in the partition key
`partdefid`	`oid`NOT NULL	The OID of the pg_class entry for the default partition of this partitioned table, or zero if this partitioned table does not have a default partitionReferences:`pg_class.oid`
`partattrs`	`int2vector`NOT NULL	This is an array of partnatts values that indicate which table columns are part of the partition key. For example, a value of 1 3 would mean that the first and the third table columns make up the partition key. A zero in this array indicates that the corresponding partition key column is an expression, rather than a simple column reference.References:`pg_attribute.attnum`
`partclass`	`oidvector`NOT NULL	For each column in the partition key, this contains the OID of the operator class to use. See pg_opclass for details.References:`pg_opclass.oid`
`partcollation`	`oidvector`NOT NULL	For each column in the partition key, this contains the OID of the collation to use for partitioning, or zero if the column is not of a collatable data type.References:`pg_collation.oid`
`partexprs`	`pg_node_tree`	Expression trees (in nodeToString() representation) for partition key columns that are not simple column references. This is a list with one element for each zero entry in partattrs. Null if all partition key columns are simple references.

Columns marked "implicit" are not included in SELECT *; some early statistics views are completed from same-version source, and the extra provenance is shown in the column description.

Common system columns 6

System attributes PostgreSQL provides, normally not expanded by SELECT *. Kept separately so they are not mixed in with ordinary columns.

Columns	Type	attnum
`tableoid`	`oid`	-6
`cmax`	`cid`	-5
`xmax`	`xid`	-4
`cmin`	`cid`	-3
`xmin`	`xid`	-2
`ctid`	`tid`	-1

Column evolution matrix

Hover a cell for the column type

PresentAdded / type or attribute changeRemoved

COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10
`partrelid`	–	–	–	–	–	–	–
`partstrat`	–	–	–	–	–	–	–
`partnatts`	–	–	–	–	–	–	–
`partattrs`	–	–	–	–	–	–	–
`partclass`	–	–	–	–	–	–	–
`partcollation`	–	–	–	–	–	–	–
`partexprs`	–	–	–	–	–	–	–
`partdefid`	–	–	–	–	–	–	–	–

9.0 is the coverage baseline; a column already present in the baseline is not marked as added. The matrix aligns columns by name, so a rename appears as the old column removed and a new column added.

Evolution timeline

Changes between adjacent majors

PostgreSQL 14 ← 13

2 column description updates

PostgreSQL 11 ← 10

+ partdefid1 column description updates

PostgreSQL 10 ← 9.6Catalog added

+ partrelid+ partstrat+ partnatts+ partattrs+ partclass+ partcollation+ partexprs

Compare any two versions

FROMTOInclude description updates

Pick two versions to see added, removed, and retyped columns. The interactive comparison needs JavaScript; the evolution timeline reads fine without it.