How can I specify the default value of a 1:Many relationship ... for example take a user that has 5 phone numbers ... I need to record the "preferred" phone number. Should I use an attribute on the phone_number record to indicate the preferred one - or have a attribute of the user record (How can I specify the default value of a 1:Many
阅读背景：
SQL架构 - 默认值为1：很多
来源：互联网
分享到：
