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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<refentry id="fn_sqrt">
<refmeta>
<refentrytitle>sqrt</refentrytitle>
<refmiscinfo>number</refmiscinfo>
</refmeta>
<refnamediv>
<refname>sqrt</refname>
<refpurpose>calculate square root</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_sqrt">
<funcprototype id="fproto_sqrt">
<funcdef><function>sqrt</function></funcdef>
<paramdef>in <parameter>x</parameter> double precision</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc"><title>Description</title>
<para><function>sqrt</function> calculates the square root of its
argument and returns it as a IEEE 64-bit float.</para>
</refsect1>
<refsect1 id="params"><title>Parameters</title>
<refsect2><title>x</title>
<para><type>double precision</type></para>
</refsect2>
</refsect1>
<refsect1 id="ret"><title>Return Values</title>
<para><function>sqrt</function> returns a IEEE 64-bit float.</para>
</refsect1>
<refsect1 id="examples"><title>Examples</title>
<example id="ex_sqrt"><title>Stored Procedure Example</title>
<para>Calculate square roots of integers between 2 numbers.</para>
<screen>
SQL> create procedure
calc_sqrts (in _from integer, in _to integer)
{
declare i integer;
declare result double precision;
result_names (i, result);
i := _from;
while (i < _to)
{
result (i, sqrt (i));
i := i + 1;
}
}
;
(0) (0) (1) (1) (1) (1) (1) (1) (1) (1) (2) (2) (2) (1)
Done. -- 7 msec.
SQL> calc_sqrts(1, 10);
i result
INTEGER NOT NULL DOUBLE PRECISION NOT NULL
_______________________________________________________________________________
1 1.000000
2 1.414214
3 1.732051
4 2.000000
5 2.236068
6 2.449490
7 2.645751
8 2.828427
9 3.000000
9 Rows. -- 3 msec.
</screen>
</example>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<link linkend="fn_exp"><function>exp</function></link>,
<link linkend="fn_log"><function>sqrt</function></link>,
<link linkend="fn_log10"><function>log10</function></link>,
<link linkend="fn_power"><function>power</function></link>
</para>
</refsect1>
</refentry>
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