主键、引用完整性和检查约束。

Primary key, referential integrity, and check constraints.

youdao

表必须具有相同的主键、唯一索引或唯一约束。

Tables must have the same primary key, unique index, or unique constraint.

youdao

唯一约束是表的主键，因此不能移除。

Can't remove unique constraint since it's the primary key of a table.

youdao

唯一约束是表的主键，因此不能移除。

Can't remove unique constraint since it's the primary key of a table.

youdao