| 1. | This is the primary table for the user resource
这是用户资源的基本表。按 |
| 2. | This is the primary table for the new content resource
该表是新内容资源的基本表（ primary table ） 。 |
| 3. | Deleting rows from a primary table if there are matching related rows
在有匹配的相关行的情况下删除主表中的行。 |
| 4. | Changing values in a primary table that causes orphaned rows in a related table
在主表中更改值（可导致相关表中出现孤立行） 。 |
| 5. | The matching column from the primary table is a primary key or has a unique constraint
来自主键表的匹配列是主键或具有唯一约束。 |
| 6. | Adding or changing rows to a related table if there is no associated row in the primary table
在主表中没有关联行的情况下在相关表中添加或更改行。 |
| 7. | You can also establish a foreign key in a secondary table to link with a primary key in a primary table
您还可以在次表中建立外键，以链接主表中的主键。 |
| 8. | You should consider putting the duplicated data in another table with a link back to the primary table
）对应于多列，则应考虑将重复的数据置于链接回主表的另一个表中。 |
| 9. | By storing the data in two separate tables , the primary table can be simple in design and still handle the occasional need for storing this information
通过将数据存储在两个不同的表中，主表的设计会非常简单，而且仍能够满足存储此信息的临时需要。 |
| 10. | If you have a table with several nullable columns and several of the rows have null values in the columns , you should consider putting these columns in another table linked to the primary table
如果某一表中有几个可为空值的列，并且列中有几行包含空值，则应考虑将这些列置于链接到主表的另一表中。 |
