目录1. 命令简介2. 命令的基本语法和用法2.1 语法格式2.2 使用示例2.2.1 列出当前目录下的文件和文件夹2.2.2 列出指定目录下的内容2.2.3 显示隐藏文件（以 . 开头的文件）2.2.4 以详细列表形式显示文件信息3. 命令的
Every time you make use of a derived table, that query is going to be executed. When using a CTE, that result set is pulled back once and only once within a single query.
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