Make sure each table has a primary key.
确保每个表都有一个主键。
Every record in the table has a unique ID called the primary key.
表中的每个记录都有一个惟一的ID，称为主键。
The target table must have a primary key.
目标表必须有一个主键。
To help with replication ER requires that the table have a primary key defined.
要实现更好的复制，ER要求表定义一个主键。
Each table has an id field that serves as the primary key.
每个表有一个用作主键的id字段。
So, in the case of the book table, there is a primary key field called book_id.
所以，在book表这个示例中，有一个主键字段叫做book_id。
The row key is the primary key of the table and is typically a string.
行键是表的主键，通常是一个字符串。
If you recall, your DB2 table was created specifying the primary key of the ACCOUNT_NUM column.
您可以回想一下，创建db2表时指定了account_num列作为主键。
The first column (ID) is the primary key of the table.
第一列(ID)是此表的主键。
The Customer table has primary key cust_num.
customer表的主键是cust_num。
The location table has primary key location_id.
location表的主键是location_id。
The Time table has primary key date_time.
Time表的主键是 date_time。
Step 5: Adding a primary key to a table.
步骤5：向表添加主键。
In fact, it's the primary key of the dw_authors table, so it must exist.
事实上这是dw_authors表的主键，因此必须有。
Why does DROP PRIMARY KEY affects ALL table rows?
为什么删除主键会影响所有的表行吗？
Usually, the primary key field of the source table makes a good choice.
通常，源表的主键值是一个很好的选择。
Primary key: the key to the database table domain.
主键：数据库表中的关键域。
Can't remove unique constraint since it's the primary key of a table.
唯一约束是表的主键，因此不能移除。
The primary key is updated in the database when you save your table.
当保存表时，主键将在数据库中进行更新。
A table can have only one primary key.
一个表只能有一个主键。
A table usually includes a primary key that ensures every row is unique.
表通常包括一个主键，该主键确保每个行都是唯一的。
This table has autonumber as the primary key.
该表已为自动编号主键。
This table has autonumber as the primary key.
该表已为自动编号主键。
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