This tutorial describes subqueries stated as conditions in the WHERE clause, which are useful for simpler comparison queries.

本教程描述在 WHERE 子句中作为条件的子查询，这些子查询对于较简单的比较查询很有用。

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This needs to be installed in order to create and run the application as described in this tutorial.

之所以要安装这项软件，是因为需要创建并运行如本教程所述的应用程序。

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The code presented in this tutorial is built to be as cross-browser compatible as possible, but some features will not work in all browsers.

本教程中提供的代码尽可能是跨浏览器兼容的，但是一些功能将无法在所有浏览器中使用。

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