在构建PD F文件时，构建无表结构就像构建HTML一样简单。
No table structure is as easy as HTML when you are building PDF files.
这个表也很简单，在SQL中创建结构使用的数据定义语言(DDL)如清单4所示。
It's also pretty simple, and the data definition language (DDL), which is the language you use to create structures in SQL, is in Listing 4.
包含简单编码结构（如含有动态数据的表循环）的能力形成了大多数动态 Web 页面的主干。
The ability to include simple coding structures, such as looping for tables with dynamic data, forms the backbone of most dynamic Web pages.
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