外键可以让您将一张表中的一行与另一张表中的一行相关起来。
Foreign keys allow you to relate a row in one table with a row in another.
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。
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.
警察事先在复印机里放置了一张写着“他在撒谎”的纸张,每当他们认为嫌疑犯没说实话时,就按下“复印”键。
The message "He's lying" was placed in the copier, and police pressed the copy button each time they thought the suspect wasn't telling the truth.
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