The column key is the concatenation of the family name, the: symbol, and the label.
column键由族名、：号和标签组成。
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。
Key was a symbol of authority.
钥匙是权柄的象征。
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。
The foreign key side is also denoted by a key symbol.
外键方也由键符号表示。
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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