Development of Music Online Teaching System Based on Distributed Database Search Technology

Table 5

Reply form.

Field name	Field type	Illustrate	Constraint
Reply _id	Integer	Unique identifier	Primary key, cannot be empty
Comment_id	Integer	Reply to the comment id	Foreign key, cannot be empty
User_id	Integer	User id	Foreign key, cannot be empty
To_user_id	Integer	User id	Foreign key, can be empty
Public_time	Datetime	Issuing time	Cannot be empty
Content	Text	Comments	Cannot be empty