><li><p><span>默认端口信息：5432</span></p></li><li><p><span>数据库特有函数：</span></p><ul><li><p><span>特有用法：select extract(dow from now())</span></p></li><li><p><span>延迟函数：pg_sleep()</span></p></li></ul></li><li><p><span>返回的错误类型：</span></p><pre class="md-fences md-end-block ty-contain-cm modeLoaded" spellcheck="false" lang="mysql"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="mysql"><div style="overflow: hidden; position: relat