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。
A relationship between the main foreign key constraint graph.
一个关系主外键约束图。
A foreign key is a constraint that enforces referential integrity.
外部索引键是强制使用参考完整性的条件约束。
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。
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。
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