They say a foreign key is to make possible a relationship between two tables, but I can do this in my statements with JOINs. Exactly what can I do with a foreing key in a SQL statement that I can't do with a JOIN? Or is a foreign key only to help us while we are working with tables in the database?They say a foreign key is to make possible a re
阅读背景：
对于在SQL语句中无法使用JOIN的外键，我该怎么办？
来源：互联网
分享到：
