drop_sequence.sgml

关系型数据库 Postgresql 6.5.2

<refentry id="SQL-DROPSEQUENCE">
 <refmeta>
  <refentrytitle>
   DROP SEQUENCE
  </refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>
 <refnamediv>
  <refname>
   DROP SEQUENCE
  </refname>
  <refpurpose>
   Removes an existing sequence
  </refpurpose>
 </refnamediv>
 <refsynopsisdiv>
  <refsynopsisdivinfo>
   <date>1998-09-22</date>
  </refsynopsisdivinfo>
  <synopsis>
DROP SEQUENCE <replaceable class="PARAMETER">name</replaceable> [, ...]
  </synopsis>
  
  <refsect2 id="R2-SQL-DROPSEQUENCE-1">
   <refsect2info>
    <date>1998-09-22</date>
   </refsect2info>
   <title>
    Inputs
   </title>
   <para>
    <variablelist>
     <varlistentry>
      <term><replaceable class="PARAMETER">name</replaceable></term>
      <listitem>
       <para>
	The name of a sequence.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>

  <refsect2 id="R2-SQL-DROPSEQUENCE-2">
   <refsect2info>
    <date>1998-09-22</date>
   </refsect2info>
   <title>
    Outputs
   </title>
   <para>

    <variablelist>
     <varlistentry>
      <term><computeroutput>
DROP
       </computeroutput></term>
      <listitem>
       <para>
	The message returned if the sequence is successfully dropped.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><computeroutput>
WARN: Relation "<replaceable class="parameter">name</replaceable>" does not exist.
       </computeroutput></term>
      <listitem>
       <para>
	This message occurs if the specified sequence does not exist.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>
 </refsynopsisdiv>

 <refsect1 id="R1-SQL-DROPSEQUENCE-1">
  <refsect1info>
   <date>1998-09-22</date>
  </refsect1info>
  <title>
   Description
  </title>
  <para>
   <command>DROP SEQUENCE</command> removes sequence number generators from the
   data base. With the current implementation of sequences as
   special tables it works just like the <command>DROP TABLE</command>
   statement.
  </para>

  <refsect2 id="R2-SQL-DROPSEQUENCE-3">
   <refsect2info>
    <date>1998-09-22</date>
   </refsect2info>
   <title>
    Notes
   </title>
   <para>
    The <command>DROP SEQUENCE</command> statement is a
    <productname>Postgres</productname>
    language extension.
   </para>
   <para>
    Refer to the <command>CREATE SEQUENCE</command> statement for
    information on how to create a sequence.
   </para>
  </refsect2>
 </refsect1>

 <refsect1 id="R1-SQL-DROPSEQUENCE-2">
  <title>
   Usage
  </title>
  <para>
   To remove sequence <literal>serial</literal> from database:

   <programlisting>
DROP SEQUENCE serial;
   </programlisting>
  </para>
 </refsect1>
 
 <refsect1 id="R1-SQL-DROPSEQUENCE-3">
  <title>
   Compatibility
  </title>
  <para>
  </para>
  
  <refsect2 id="R2-SQL-DROPSEQUENCE-4">
   <refsect2info>
    <date>1998-09-22</date>
   </refsect2info>
   <title>
    SQL92
   </title>
   <para>
    There is no <command>DROP SEQUENCE</command> in <acronym>SQL92</acronym>.
   </para>
  </refsect2>
 </refsect1>
</refentry>

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