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Primary key, referential integrity, and check constraints.
主键、引用完整性和检查约束。
youdao
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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。
youdao
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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。
youdao