| 1. | A table can have multiple unique constraints
一个表可以有多个unique约束。 |
| 2. | Used in a check or unique constraint
用于check或unique约束中的列。 |
| 3. | Primary key or unique constraint with a nonclustered index
非聚集索引的primary key或unique约束。 |
| 4. | Each primary key and unique constraint generates an index
每个primary key和unique约束都将生成一个索引。 |
| 5. | Table has a unique constraint
表具有unique约束。 |
| 6. | Primary key and unique constraints are enabled by rebuilding the associated index
重新生成关联的索引时将启用primary key和unique约束。 |
| 7. | Specifies that a clustered or nonclustered index is created for the primary key or unique constraint
指定为primary key或unique约束创建聚集或非聚集索引。 |
| 8. | Indicate that a clustered or a nonclustered index is created for the primary key or unique constraint
指示为primary key或unique约束创建聚集索引还是非聚集索引。 |
| 9. | Indexes are automatically created when primary key and unique constraints are defined on table columns
对表列定义了primary key约束和unique约束时，会自动创建索引。 |
| 10. | However , changing the length of a variable - length column used in a check or unique constraint is allowed
但是，允许更改用于check或unique约束中的长度可变的列的长度。 |
