A foreign key is one or more data attributes that appear in one table that may be part of, or is coincidental with, the key of another table.
外键是在一张表中出现的一个或多个数据属性；它可以是另一张表的键的一部分，或者干脆碰巧就是另一张表的键。
The aim is to provide you with a solid foundation on issues relating to managed entities, such as attributes, setting and getting attribute values, and the key role of notifications in the IT space.
本教程旨在为您提供与托管实体相关的问题的坚实基础，如属性、获取和设置属性值以及通知在 IT 领域的主要作用。
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