PostgreSQL 7.2 Documentation
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# pkey

## Name

pkey -- returns the primary key of a table

## Synopsis

    pkey(table)

### Parameters

`table`

  name of table.

### Return Type

string

  Name of field which is the primary key of the table.

## Description

`pkey()` method returns the primary key of a table. Note that this raises an exception if the table does not have a primary key.

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Database wrapper class: `DB` | Up | get_databases