The globalsection applies the rules globally to all SQL statements.
这个全局区段将规则全局地应用到所有 SQL 语句上。
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For example, if you would like to change your preferences regarding 'Global issues', you can click on this section.
例如,如果您想修改关于“全球性问题”的偏好选项,您可以单击这部分。
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Now that you know how to do simple operations with global variables, this section provides some interesting scenarios that show you how you can use them.