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<?xml version="1.0" encoding="ISO-8859-1"?>
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<refentry id="fn_sinv_create_inverse">
<refmeta>
<refentrytitle>sinv_create_inverse</refentrytitle>
<refmiscinfo>sql</refmiscinfo>
</refmeta>
<refnamediv>
<refname>sinv_create_inverse</refname>
<refpurpose>Creates inverse mapping for the mentioned functions.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_sinv_create_inverse">
<funcprototype id="fproto_sinv_create_inverse">
<funcdef><function>sinv_create_inverse</function></funcdef>
<paramdef>in <parameter>_SINVM_NAME_IN</parameter> varchar</paramdef>
<paramdef>in <parameter>_SINV_INVERSE</parameter> any</paramdef>
<paramdef>in <parameter>_SINVM_FLAGS</parameter> integer</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_sinv_create_inverse"><title>Description</title>
<para>Creates inverse mapping for the mentioned functions (as described in the doc section
<link linkend="sqlinverse">SQL Inverse Functions</link>)</para>
</refsect1>
<refsect1 id="params_sinv_create_inverse">
<title>Parameters</title>
<refsect2><title>_SINVM_NAME_IN</title>
<para>the name of the forward function</para></refsect2>
<refsect2><title>_SINV_INVERSE</title>
<para>an array of the names of the inverse functions (for each part).</para></refsect2>
<refsect2><title>_SINVM_FLAGS</title>
<para>bit mask with:</para>
<para><![CDATA[[bit 0 - 1 if x > y <-> f(x) > f (y)) This is true of unit conversions in
general but not true of hash functions or arbitrary id mappings. If the bit
is set the function call may be optimized away if both operands of a
comparison are calls to this function. If this is not set, the function
calls may only be removed in the case of equality.]]></para>
</refsect2>
</refsect1>
<refsect1 id="seealso_sinv_create_inverse"><title>See Also</title>
<para>
<link linkend="fn_sinv_create_key_mapping"><function>sinv_create_key_mapping</function></link>,
<link linkend="fn_sinv_drop_inverse"><function>sinv_drop_inverse</function></link>
</para>
</refsect1>
</refentry>
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