一般的数据库，例如一家公司的一组雇员或者顾客记录，可能包含多个检索关键码。
A typical database, such as a collection of employee or customer records maintained by a business, may contain multiple search keys.
一般的数据库，例如一家公司的一组雇员或者顾客记录，可能包含多个检索关键码。
A typical database, such as a collection of employee or customer records maintained by a business, may contain multiple search keys.
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