LEI为自动生成和外键表的填充提供了一个功能。

LEI provides a function for the automatic generation and population of the external key table.

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这些键值可以存储在现有的数据表中或者存储在单独创建的称作外键表的表中。

These keys can be stored in an existing data table or in a separately created table referred to as the external key table.

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如果为实线，则当在外键表中添加或修改行时，DBMS将强制关系的引用完整性。

If the line appears solid, the DBMS enforces referential integrity for the relationship when rows are added or modified in the foreign-key table.

youdao

All right, so the type of bond energies that we can go and look up in tables are individual atom bonds, H-H, F-F, and the like.

好的，键能的类型,我们能够在表中查到,都是独立的原子键，H-H，F-F以及类似的。

麻省理工公开课 - 固态化学导论课程节选