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Postgres documentation

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(which could be a table, view, index, or sequence),

their types, and any special attributes such as <literal>NOT NULL</literal>

or defaults, if any.

If the relation is, in fact, a table, any defined indexes are also listed.

If the relation is, in fact, a table, any defined indices, primary keys, unique

constraints and check constraints are also listed.

If the relation is a view, the view definition is also shown.

</para>