问题
In phpMyAdmin v2.8.2.4 for MyISAM tables, the "Relation View" appears under the Structure tab. It shows a list of Internal Relations. But what do these do, given that MyISAM does not support foreign key constraints or relational integrity?
By phpMyAdmin version 3.2.0.1 this page ("Relation View") no longer appears for MyISAM tables. So does this mean that it wasn't doing anything in the first place?
Any explanations much appreciated. Justin
回答1:
Foreign keys in MyISAM are for advisory purposes only. You can look at them to see where the referential integrity would be, if there were any. It's easier to understand the schema that way than to guess relations by looking at the indexes created as a side-effect.
I don't know why it'd disappear in phpMyAdmin, unless it's a config issue (I believe the view can be disabled)?
来源：https://stackoverflow.com/questions/1721727/what-do-internal-relations-do-in-phpmyadmin-for-myisam-tables