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

表必须具有相同的主键、唯一索引或唯一约束。

youdao

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。

youdao

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。

youdao