So, it violates unique constraint across the collection.
所以，它违背了独特的约束集合。
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 unique constraint is created in the database when you save the table.
当保存表时，将在数据库中创建该唯一约束。
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。
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。
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