主键列由其行选择器中的主键符号标识。
A primary key column is identified by a primary key symbol in its row selector.
在表设计器中，单击要定义为主键的数据库列的行选择器。
In Table Designer, click the row selector for the database column you want to define as the primary key.
如果要选择多列，在单击其他列的行选择器时按住ctrl键。
If you want to select multiple columns, hold down the CTRL key while you click the row selectors for the other columns.
每个定义的第一行包括三个选择器，这些选择器减少了受影响的元素的数量。
The first line of each definition consists of three selectors that narrow the number of affected elements down.
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。
The row selector displays a key symbol if the column is in the table's primary key.
声明每个选择器时都用一个新行。
选择器和声明位于同一行上，如下所示。
The selector and declaration are positioned on the same line, as shown.
选择器和左大括号各自显示在自己的行上，声明在后续行上缩进，右大括号和相应的左大括号对齐，如下所示。
The selector and initial brace each appear on their own lines, declarations are indented on subsequent lines, and the closing brace is aligned with the matching opening brace, as shown.
选择器和左大括号各自显示在自己的行上，声明在后续行上缩进，右大括号和相应的左大括号对齐，如下所示。
The selector and initial brace each appear on their own lines, declarations are indented on subsequent lines, and the closing brace is aligned with the matching opening brace, as shown.
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