## 52.36. `pg_partitioned_table`

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 The catalog `pg_partitioned_table` stores information about how tables are partitioned.

**Table 52.36. `pg_partitioned_table` Columns**

|                                                                                                                                                                                                               Column Type<br/><br/> Description                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                            `partrelid` `oid` (references [`pg_class`](catalog-pg-class.html).`oid`)<br/><br/> The OID of the [`pg_class`](catalog-pg-class.html) entry for this partitioned table                                                                                                                                             |
|                                                                                                                                                         `partstrat` `char`<br/><br/> Partitioning strategy; `h` = hash partitioned table, `l` = list partitioned table, `r` = range partitioned table                                                                                                                                                         |
|                                                                                                                                                                                            `partnatts` `int2`<br/><br/> The number of columns in the partition key                                                                                                                                                                                            |
|                                                                                             `partdefid` `oid` (references [`pg_class`](catalog-pg-class.html).`oid`)<br/><br/> The OID of the [`pg_class`](catalog-pg-class.html) entry for the default partition of this partitioned table, or zero if this partitioned table does not have a default partition                                                                                              |
|`partattrs` `int2vector` (references [`pg_attribute`](catalog-pg-attribute.html).`attnum`)<br/><br/> 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.|
|                                                                                                        `partclass` `oidvector` (references [`pg_opclass`](catalog-pg-opclass.html).`oid`)<br/><br/> For each column in the partition key, this contains the OID of the operator class to use. See [`pg_opclass`](catalog-pg-opclass.html) for details.                                                                                                        |
|                                                                                              `partcollation` `oidvector` (references [`pg_collation`](catalog-pg-collation.html).`oid`)<br/><br/> 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.                                                                                               |
|                                                                                   `partexprs` `pg_node_tree`<br/><br/> 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.                                                                                    |

