A primary key column is identified by a primary key symbol in its row selector.
主键列由其行选择器中的主键符号标识。
The row selector displays a key symbol if the column is in the table's primary key.
如果该资料行位于资料表的主索引键，资料列选择器将显示索引键符号。
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。
应用推荐