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 <p>SQL functions for random sampling.
 <a href="#details">More...</a></p>

 <p><a href="sample_8sql__in_source.html">Go to the source code of this file.</a></p>
 <table class="memberdecls">
 <tr><td colspan="2"><h2><a name="func-members"></a>
 Functions</h2></td></tr>
 <tr><td class="memItemLeft" align="right" valign="top">aggregate bigint&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#aa0da3745c7eaecfbe4d21e2abac14906">weighted_sample</a> (bigint value, float8 weight)</td></tr>
 <tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Sample a single row according to weights.  <a href="#aa0da3745c7eaecfbe4d21e2abac14906"></a><br/></td></tr>
 </table>
 <hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
 <div class="textblock"><dl class="see"><dt><b>See also:</b></dt><dd>For an overview of random-sampling functions, see the module description <a class="el" href="group__grp__sample.html">Random Sampling</a>. </dd></dl>

 <p>Definition in file <a class="el" href="sample_8sql__in_source.html">sample.sql_in</a>.</p>
 </div><hr/><h2>Function Documentation</h2>
 <a class="anchor" id="aa0da3745c7eaecfbe4d21e2abac14906"></a><!-- doxytag: member="sample.sql_in::weighted_sample" ref="aa0da3745c7eaecfbe4d21e2abac14906" args="(bigint value, float8 weight)" -->
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           <td class="memname">aggregate bigint weighted_sample </td>
           <td>(</td>
           <td class="paramtype">bigint&#160;</td>
           <td class="paramname"><em>value</em>, </td>
         </tr>
         <tr>
           <td class="paramkey"></td>
           <td></td>
           <td class="paramtype">float8&#160;</td>
           <td class="paramname"><em>weight</em>&#160;</td>
         </tr>
         <tr>
           <td></td>
           <td>)</td>
           <td></td><td></td>
         </tr>
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 <div class="memdoc">
 <dl><dt><b>Parameters:</b></dt><dd>
   <table class="params">
     <tr><td class="paramname">value</td><td>Value of row. Uniqueness is not enforced. If a value occurs multiple times, the probability of sampling this value is proportional to the sum of its weights. </td></tr>
     <tr><td class="paramname">weight</td><td>Weight for row. A negative value here is treated has zero weight. </td></tr>
   </table>
   </dd>
 </dl>
 <dl class="return"><dt><b>Returns:</b></dt><dd><code>identifier</code> of the selected row. The probability of sampling any particular row <code>(value, weight)</code> is <code>weight/SUM(weight)</code>. </dd></dl>

 <p>Definition at line <a class="el" href="sample_8sql__in_source.html#l00085">85</a> of file <a class="el" href="sample_8sql__in_source.html">sample.sql_in</a>.</p>

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	<p>SQL functions for random sampling.
	<a href="#details">More...</a></p>

	<p><a href="sample_8sql__in_source.html">Go to the source code of this file.</a></p>
	<table class="memberdecls">
	<tr><td colspan="2"><h2><a name="func-members"></a>
	Functions</h2></td></tr>
	<tr><td class="memItemLeft" align="right" valign="top">aggregate bigint </td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#aa0da3745c7eaecfbe4d21e2abac14906">weighted_sample</a> (bigint value, float8 weight)</td></tr>
	<tr><td class="mdescLeft"> </td><td class="mdescRight">Sample a single row according to weights. <a href="#aa0da3745c7eaecfbe4d21e2abac14906"></a><br/></td></tr>
	</table>
	<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
	<div class="textblock"><dl class="see"><dt><b>See also:</b></dt><dd>For an overview of random-sampling functions, see the module description <a class="el" href="group__grp__sample.html">Random Sampling</a>. </dd></dl>

	<p>Definition in file <a class="el" href="sample_8sql__in_source.html">sample.sql_in</a>.</p>
	</div><hr/><h2>Function Documentation</h2>
	<a class="anchor" id="aa0da3745c7eaecfbe4d21e2abac14906"></a><!-- doxytag: member="sample.sql_in::weighted_sample" ref="aa0da3745c7eaecfbe4d21e2abac14906" args="(bigint value, float8 weight)" -->
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	<td class="memname">aggregate bigint weighted_sample </td>
	<td>(</td>
	<td class="paramtype">bigint </td>
	<td class="paramname"><em>value</em>, </td>
	</tr>
	<tr>
	<td class="paramkey"></td>
	<td></td>
	<td class="paramtype">float8 </td>
	<td class="paramname"><em>weight</em> </td>
	</tr>
	<tr>
	<td></td>
	<td>)</td>
	<td></td><td></td>
	</tr>
	</table>
	</div>
	<div class="memdoc">
	<dl><dt><b>Parameters:</b></dt><dd>
	<table class="params">
	<tr><td class="paramname">value</td><td>Value of row. Uniqueness is not enforced. If a value occurs multiple times, the probability of sampling this value is proportional to the sum of its weights. </td></tr>
	<tr><td class="paramname">weight</td><td>Weight for row. A negative value here is treated has zero weight. </td></tr>
	</table>
	</dd>
	</dl>
	<dl class="return"><dt><b>Returns:</b></dt><dd><code>identifier</code> of the selected row. The probability of sampling any particular row <code>(value, weight)</code> is <code>weight/SUM(weight)</code>. </dd></dl>

	<p>Definition at line <a class="el" href="sample_8sql__in_source.html#l00085">85</a> of file <a class="el" href="sample_8sql__in_source.html">sample.sql_in</a>.</p>

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