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

Table 4

Comment form.

Field name	Field type	Illustrate	Constraint
Commented_id	Integer	Unique identifier	Primary key, cannot be empty
Song_id	Integer	The id of the song to which the comment belongs	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
Floor	Integer	Floor number	Cannot be empty
Content	Text	Comments	Cannot be empty