The foreign key side is also denoted by a key symbol.

外键方也由键符号表示.

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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.

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The primary key side of a one - to - one relationship is denoted by a key symbol.

一对一关系的主键方由键符号表示.

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