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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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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In Listing 5, you have a standard primary key column called PO_ID (that is, purchase order ID).

在清单5中，您有一个称为PO_ID的标准主键列(即订单id)。

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Note, however, that we cannot update the primary key columns or any other key columns that you declare; in this case, EMP_ID is a primary key column.

但是请注意，我们不能修改您声明的主键列或任何其他的键列；在本例中，EMP _ ID是主键列。

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If informational check constraints exist on the primary key column, you should explicitly specify informational check constraints on their corresponding foreign key columns. For example.

如果在主键列上存在信息检查约束，那么应该在它们相应的外键列上指定信息检查约束。

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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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It sets up two accessors: accessor 0 contains only the primary key column (ID) and accessor 1 contains other columns.

它设置两个访问器：访问器0仅包含主键列id，访问器1包含其他列。

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In this type of table, you define a primary key column, a MIME type column, and one or more generic columns as BLOB data.

在这种类型的表中，你定义了一个主键列，一个MIME类型列，和一个或多个通用列用来表示BLOB数据。

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You also want to be able to write data to all the columns except the primary key (because you cannot write to the primary key column).

还希望能够将数据写入除主键外（因为不能向主键列写入）的所有列。

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You also want to be able to write data to all the columns except the primary key (because you cannot write to the primary key column).

还希望能够将数据写入除主键外（因为不能向主键列写入）的所有列。

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