


  
  <dl class="simple">
<dt>类别：</dt><dd><p><a class="reference internal" href="../functions-numeric"><span class="doc">数值函数</span></a> （三角函数）</p>
</dd>
</dl>
<section id="pi">
<h1>PI<a class="headerlink" href="#pi" title="Link to this heading">¶</a></h1>
<p>将 pi 的值作为浮点值返回。</p>
<section id="syntax">
<h2>语法<a class="headerlink" href="#syntax" title="Link to this heading">¶</a></h2>
<div class="relative group text-sm"><div class="highlight-sqlsyntax notranslate"><div class="highlight"><pre><span></span><span class="vc">PI</span><span class="nx">()</span>
</pre></div>
</div><div data-codeblock-index="0" class="copybutton"><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 384 512" class="copybutton-icon icon-copy"><path d="M192 0c-41.8 0-77.4 26.7-90.5 64H64C28.7 64 0 92.7 0 128V448c0 35.3 28.7 64 64 64H320c35.3 0 64-28.7 64-64V128c0-35.3-28.7-64-64-64H282.5C269.4 26.7 233.8 0 192 0zm0 64a32 32 0 1 1 0 64 32 32 0 1 1 0-64zM112 192H272c8.8 0 16 7.2 16 16s-7.2 16-16 16H112c-8.8 0-16-7.2-16-16s7.2-16 16-16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 512 512" class="copybutton-icon icon-copied hidden"><path d="M470.6 105.4c12.5 12.5 12.5 32.8 0 45.3l-256 256c-12.5 12.5-32.8 12.5-45.3 0l-128-128c-12.5-12.5-12.5-32.8 0-45.3s32.8-12.5 45.3 0L192 338.7 425.4 105.4c12.5-12.5 32.8-12.5 45.3 0z"></path></svg><span>Copy</span></div></div>
</section>
<section id="examples">
<h2>示例<a class="headerlink" href="#examples" title="Link to this heading">¶</a></h2>
<blockquote>
<div><div class="relative group text-sm"><div class="highlight-sqlexample-lower notranslate"><div class="highlight"><pre><span></span><span class="ni">SELECT</span> <span class="nd">PI</span><span class="p">();</span>
<span class="no">-------------+</span>
    <span class="no">PI()     |</span>
<span class="no">-------------+</span>
 <span class="no">3.141592654 |</span>
<span class="no">-------------+</span>
</pre></div>
</div><div data-codeblock-index="1" class="copybutton"><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 384 512" class="copybutton-icon icon-copy"><path d="M192 0c-41.8 0-77.4 26.7-90.5 64H64C28.7 64 0 92.7 0 128V448c0 35.3 28.7 64 64 64H320c35.3 0 64-28.7 64-64V128c0-35.3-28.7-64-64-64H282.5C269.4 26.7 233.8 0 192 0zm0 64a32 32 0 1 1 0 64 32 32 0 1 1 0-64zM112 192H272c8.8 0 16 7.2 16 16s-7.2 16-16 16H112c-8.8 0-16-7.2-16-16s7.2-16 16-16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 512 512" class="copybutton-icon icon-copied hidden"><path d="M470.6 105.4c12.5 12.5 12.5 32.8 0 45.3l-256 256c-12.5 12.5-32.8 12.5-45.3 0l-128-128c-12.5-12.5-12.5-32.8 0-45.3s32.8-12.5 45.3 0L192 338.7 425.4 105.4c12.5-12.5 32.8-12.5 45.3 0z"></path></svg><span>Copy</span></div></div>
</div></blockquote>
</section>
</section>




PI¶

语法¶

示例¶