1<!--
2doc/src/sgml/ref/drop_statistics.sgml
3PostgreSQL documentation
4-->
5
6<refentry id="SQL-DROPSTATISTICS">
7 <indexterm zone="sql-dropstatistics">
8  <primary>DROP STATISTICS</primary>
9 </indexterm>
10
11 <refmeta>
12  <refentrytitle>DROP STATISTICS</refentrytitle>
13  <manvolnum>7</manvolnum>
14  <refmiscinfo>SQL - Language Statements</refmiscinfo>
15 </refmeta>
16
17 <refnamediv>
18  <refname>DROP STATISTICS</refname>
19  <refpurpose>remove extended statistics</refpurpose>
20 </refnamediv>
21
22 <refsynopsisdiv>
23<synopsis>
24DROP STATISTICS [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable> [, ...] [ CASCADE | RESTRICT ]
25</synopsis>
26 </refsynopsisdiv>
27
28 <refsect1>
29  <title>Description</title>
30
31  <para>
32   <command>DROP STATISTICS</command> removes statistics object(s) from the
33   database.  Only the statistics object's owner, the schema owner, or a
34   superuser can drop a statistics object.
35  </para>
36
37 </refsect1>
38
39 <refsect1>
40  <title>Parameters</title>
41
42  <variablelist>
43   <varlistentry>
44    <term><literal>IF EXISTS</literal></term>
45    <listitem>
46     <para>
47      Do not throw an error if the statistics object does not exist. A notice
48      is issued in this case.
49     </para>
50    </listitem>
51   </varlistentry>
52
53   <varlistentry>
54    <term><replaceable class="PARAMETER">name</replaceable></term>
55    <listitem>
56     <para>
57      The name (optionally schema-qualified) of the statistics object to drop.
58     </para>
59    </listitem>
60   </varlistentry>
61
62   <varlistentry>
63    <term><literal>CASCADE</literal></term>
64    <term><literal>RESTRICT</literal></term>
65
66    <listitem>
67     <para>
68      These key words do not have any effect, since there are no dependencies
69      on statistics.
70     </para>
71    </listitem>
72   </varlistentry>
73
74  </variablelist>
75 </refsect1>
76
77 <refsect1>
78  <title>Examples</title>
79
80  <para>
81   To destroy two statistics objects in different schemas, without failing
82   if they don't exist:
83
84<programlisting>
85DROP STATISTICS IF EXISTS
86    accounting.users_uid_creation,
87    public.grants_user_role;
88</programlisting></para>
89 </refsect1>
90
91 <refsect1>
92  <title>Compatibility</title>
93
94  <para>
95   There is no <command>DROP STATISTICS</command> command in the SQL standard.
96  </para>
97 </refsect1>
98
99 <refsect1>
100  <title>See Also</title>
101
102  <simplelist type="inline">
103   <member><xref linkend="sql-alterstatistics"></member>
104   <member><xref linkend="sql-createstatistics"></member>
105  </simplelist>
106 </refsect1>
107
108</refentry>
109