---
title: "pg_partitioned_table"
id: catalog-pg-partitioned-table
pg_version: "20devel"
---

<a id="catalog-pg-partitioned-table"></a>

## 52.37. pg_partitioned_table

The catalog pg_partitioned_table stores information about how tables are partitioned. 

**pg_partitioned_table Columns**

| Column Type | Description | 
| --- | --- |
| `partrelid` `oid` (references [pg_class](catalog-pg-class.md).`oid`) | The OID of the [pg_class](catalog-pg-class.md) entry for this partitioned table |
| `partstrat` `char` | Partitioning strategy; `h` = hash partitioned table, `l` = list partitioned table, `r` = range partitioned table |
| `partnatts` `int2` | The number of columns in the partition key |
| `partdefid` `oid` (references [pg_class](catalog-pg-class.md).`oid`) | The OID of the [pg_class](catalog-pg-class.md) 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.md).`attnum`) | 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.md).`oid`) | For each column in the partition key, this contains the OID of the operator class to use. See [pg_opclass](catalog-pg-opclass.md) for details. |
| `partcollation` `oidvector` (references [pg_collation](catalog-pg-collation.md).`oid`) | 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` | 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. |