AGGREGATE <replaceable class="PARAMETER">agg_name</replaceable> (<replaceable class="PARAMETER">agg_type</replaceable> [, ...] ) |

CAST (<replaceable>source_type</replaceable> AS <replaceable>target_type</replaceable>) |

COLLATION <replaceable class="PARAMETER">object_name</replaceable> |

COLUMN <replaceable class="PARAMETER">table_name</replaceable>.<replaceable class="PARAMETER">column_name</replaceable> |

COLUMN <replaceable class="PARAMETER">relation_name</replaceable>.<replaceable class="PARAMETER">column_name</replaceable> |

CONSTRAINT <replaceable class="PARAMETER">constraint_name</replaceable> ON <replaceable class="PARAMETER">table_name</replaceable> |

CONVERSION <replaceable class="PARAMETER">object_name</replaceable> |

DATABASE <replaceable class="PARAMETER">object_name</replaceable> |

<variablelist>

<varlistentry>

<term><replaceable class="parameter">object_name</replaceable></term>

<term><replaceable class="parameter">table_name.column_name</replaceable></term>

<term><replaceable class="parameter">relation_name</replaceable>.<replaceable>column_name</replaceable></term>

<term><replaceable class="parameter">agg_name</replaceable></term>

<term><replaceable class="parameter">constraint_name</replaceable></term>

<term><replaceable class="parameter">function_name</replaceable></term>

aggregates, collations, conversions, domains, foreign tables, functions,

indexes, operators, operator classes, operator families, sequences,

text search objects, types, and views can be schema-qualified.

When commenting on a column,

<replaceable class="parameter">relation_name</replaceable> must refer

to a table, view, composite types, or foreign table.

</para>

</listitem>

</varlistentry>