This surrogate column can be designated the primary key column.

可以将该代理列指定为主键列。

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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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Rails USES the primary key column id for various recordkeeping and referencing tasks.

Rails使用主键列id来完成各种记录保持和引用任务。

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The column family is organized by customer ID (primary key), you have columns for first name, last name, address, and all the normal customer information, plus as many rows as are needed for each purchase.

FORBES: What You Need to Know About NoSQL Databases