In Table Designer, click the row selector for the database column you want to define as the primary key.

在表设计器中，单击要定义为主键的数据库列的行选择器。

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Within a database diagram, each table can appear with three distinct features: a title bar, a row selector, and a set of property columns.

资料库图表中的每个资料表都具有三项功能：标题列、资料列选取器和一组属性栏位。

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