使用的键与用户选择的键匹配。
检查是否存在与给定操作键匹配的部分。
Checks whether there are parts that match a given action key.
确保参照完整性(referential integrity, ri)关系中的依赖表拥有与外键匹配的索引。
Ensure dependent tables in a referential integrity (ri) relationship have indexes that exactly match the foreign key.
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