清单3就是在位置标签行上增加一个标签的代码段，如图7所示。

The code snippet in listing 3 adds another TAB to the place TAB row as shown in figure 7.

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该函数在选择操作中检索行安全标签列。

This function is used in select operations to retrieve the row security label column.

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类似地，每个数据库用户也都被赋予一个安全标签，这个标签将决定他/她可以访问哪些贴了标签的数据行或列。

Similarly, each database user is assigned a security label that determines which labeled data rows or columns he or she can access.

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