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Since some preparation work had already been done, the only source changes left were changing empty-element tags like <xref linkend="foo"> to <xref linkend="foo"/>, and changing the DOCTYPE. The source files are still named *.sgml, but they are actually XML files now. Renaming could be considered later. In the build system, the intermediate step to convert from SGML to XML is removed. Everything is build straight from the source files again. The OpenSP (or the old SP) package is no longer needed. The documentation toolchain instructions are updated and are much simpler now. Peter Eisentraut, Alexander Lakhin, Jürgen Purtz
130 lines
3.2 KiB
Plaintext
130 lines
3.2 KiB
Plaintext
<!--
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doc/src/sgml/ref/drop_table.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-droptable">
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<indexterm zone="sql-droptable">
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<primary>DROP TABLE</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>DROP TABLE</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>DROP TABLE</refname>
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<refpurpose>remove a table</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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DROP TABLE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [, ...] [ CASCADE | RESTRICT ]
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>DROP TABLE</command> removes tables from the database.
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Only the table owner, the schema owner, and superuser can drop a
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table. To empty a table of rows
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without destroying the table, use <xref linkend="sql-delete"/>
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or <xref linkend="sql-truncate"/>.
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</para>
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<para>
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<command>DROP TABLE</command> always removes any indexes, rules,
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triggers, and constraints that exist for the target table.
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However, to drop a table that is referenced by a view or a foreign-key
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constraint of another table, <literal>CASCADE</literal> must be
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specified. (<literal>CASCADE</literal> will remove a dependent view entirely,
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but in the foreign-key case it will only remove the foreign-key
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constraint, not the other table entirely.)
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><literal>IF EXISTS</literal></term>
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<listitem>
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<para>
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Do not throw an error if the table does not exist. A notice is issued
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in this case.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">name</replaceable></term>
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<listitem>
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<para>
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The name (optionally schema-qualified) of the table to drop.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>CASCADE</literal></term>
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<listitem>
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<para>
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Automatically drop objects that depend on the table (such as
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views),
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and in turn all objects that depend on those objects
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(see <xref linkend="ddl-depend"/>).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>RESTRICT</literal></term>
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<listitem>
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<para>
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Refuse to drop the table if any objects depend on it. This is
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the default.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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To destroy two tables, <literal>films</literal> and
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<literal>distributors</literal>:
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<programlisting>
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DROP TABLE films, distributors;
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</programlisting></para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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This command conforms to the SQL standard, except that the standard only
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allows one table to be dropped per command, and apart from the
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<literal>IF EXISTS</literal> option, which is a <productname>PostgreSQL</productname>
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extension.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-altertable"/></member>
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<member><xref linkend="sql-createtable"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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