52.37. pg_partitioned_table
| Up | Chapter 52. System Catalogs | Home |

## 52.37. pg_partitioned_table #

The catalog pg_partitioned_table stores information about how tables are partitioned.

Table 52.37. pg_partitioned_table Columns

Column Type Description
`partrelid` oid (references pg_class.`oid`) The OID of the pg_class 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.`oid`) 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 partition
`partattrs` int2vector (references pg_attribute.`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.`oid`) For each column in the partition key, this contains the OID of the operator class to use. See pg_opclass for details.
`partcollation` oidvector (references pg_collation.`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.

| Up |
| Home |