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Standard English uses "may", "can", and "might" in different ways:
may - permission, "You may borrow my rake."
can - ability, "I can lift that log."
might - possibility, "It might rain today."
Unfortunately, in conversational English, their use is often mixed, as
in, "You may use this variable to do X", when in fact, "can" is a better
choice. Similarly, "It may crash" is better stated, "It might crash".
102 lines
2.4 KiB
Plaintext
102 lines
2.4 KiB
Plaintext
<!-- $PostgreSQL: pgsql/doc/src/sgml/ref/drop_conversion.sgml,v 1.11 2007/01/31 23:26:03 momjian Exp $ -->
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<refentry id="SQL-DROPCONVERSION">
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<refmeta>
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<refentrytitle id="SQL-DROPCONVERSION-TITLE">DROP CONVERSION</refentrytitle>
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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 CONVERSION</refname>
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<refpurpose>remove a conversion</refpurpose>
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</refnamediv>
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<indexterm zone="sql-dropconversion">
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<primary>DROP CONVERSION</primary>
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</indexterm>
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<refsynopsisdiv>
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<synopsis>
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DROP CONVERSION [ IF EXISTS ] <replaceable>name</replaceable> [ CASCADE | RESTRICT ]
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</synopsis>
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</refsynopsisdiv>
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<refsect1 id="sql-dropconversion-description">
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<title>Description</title>
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<para>
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<command>DROP CONVERSION</command> removes a previously defined conversion.
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To be able to drop a conversion, you must own the conversion.
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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 conversion does not exist.
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A notice is issued 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>name</replaceable></term>
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<listitem>
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<para>
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The name of the conversion. The conversion name can be
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schema-qualified.
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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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<term><literal>RESTRICT</literal></term>
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<listitem>
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<para>
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These key words do not have any effect, since there are no
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dependencies on conversions.
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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 id="sql-dropconversion-examples">
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<title>Examples</title>
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<para>
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To drop the conversion named <literal>myname</>:
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<programlisting>
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DROP CONVERSION myname;
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</programlisting>
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</para>
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</refsect1>
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<refsect1 id="sql-dropconversion-compat">
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<title>Compatibility</title>
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<para>
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There is no <command>DROP CONVERSION</command> statement in the SQL
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standard.
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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-alterconversion" endterm="sql-alterconversion-title"></member>
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<member><xref linkend="sql-createconversion" endterm="sql-createconversion-title"></member>
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</simplelist>
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</refsect1>
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</refentry>
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