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A relationship between the main foreign key constraint graph.
一个关系主外键约束图。
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