> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/15/internals/system-catalogs/pg_partitioned_table.md).

# 53.37. pg\_partitioned\_table

## 53.37. pg\_partitioned\_table

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

**Table 53.37. `pg_partitioned_table` Columns**

| <p>Column Type</p><p>Description</p>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| <p><code>partrelid</code> <code>oid</code> (references <a href="/15/internals/system-catalogs/pg_class.md"><code>pg\_class</code></a>.<code>oid</code>)</p><p>The OID of the <a href="/15/internals/system-catalogs/pg_class.md"><code>pg\_class</code></a> entry for this partitioned table</p>                                                                                                                                                                                                                                                                     |
| <p><code>partstrat</code> <code>char</code></p><p>Partitioning strategy; <code>h</code> = hash partitioned table, <code>l</code> = list partitioned table, <code>r</code> = range partitioned table</p>                                                                                                                                                                                                                                                                                                                                                              |
| <p><code>partnatts</code> <code>int2</code></p><p>The number of columns in the partition key</p>                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| <p><code>partdefid</code> <code>oid</code> (references <a href="/15/internals/system-catalogs/pg_class.md"><code>pg\_class</code></a>.<code>oid</code>)</p><p>The OID of the <a href="/15/internals/system-catalogs/pg_class.md"><code>pg\_class</code></a> entry for the default partition of this partitioned table, or zero if this partitioned table does not have a default partition</p>                                                                                                                                                                       |
| <p><code>partattrs</code> <code>int2vector</code> (references <a href="/15/internals/system-catalogs/pg_attribute.md"><code>pg\_attribute</code></a>.<code>attnum</code>)</p><p>This is an array of <code>partnatts</code> values that indicate which table columns are part of the partition key. For example, a value of <code>1 3</code> 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.</p> |
| <p><code>partclass</code> <code>oidvector</code> (references <a href="/15/internals/system-catalogs/pg_opclass.md"><code>pg\_opclass</code></a>.<code>oid</code>)</p><p>For each column in the partition key, this contains the OID of the operator class to use. See <a href="/15/internals/system-catalogs/pg_opclass.md"><code>pg\_opclass</code></a> for details.</p>                                                                                                                                                                                            |
| <p><code>partcollation</code> <code>oidvector</code> (references <a href="/15/internals/system-catalogs/pg_collation.md"><code>pg\_collation</code></a>.<code>oid</code>)</p><p>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.</p>                                                                                                                                                                                                                    |
| <p><code>partexprs</code> <code>pg\_node\_tree</code></p><p>Expression trees (in <code>nodeToString()</code> representation) for partition key columns that are not simple column references. This is a list with one element for each zero entry in <code>partattrs</code>. Null if all partition key columns are simple references.</p>                                                                                                                                                                                                                            |

***

原文：[PostgreSQL 15.19 Documentation](/15/internals/system-catalogs/pg_partitioned_table.md)（英文原文，待翻譯）


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