MySQL,如何重建可选多个外键

MySQL, how to restructure optional multiple foreign keys

mysql database-design relational-database
提问时间: 2014-12-31 00:00:00

用例为 NoSQL [关闭] 的

Use cases for NoSQL [closed]

sql mongodb nosql couchdb relational-database
提问时间: 2010-05-20 15:46:38

时间和原因是数据库联接昂贵?

When and why are database joins expensive?

database performance join relational-database denormalization
提问时间: 2008-10-06 09:52:19