[Retracted] Innovative Research on Teaching Method of Taekwondo in College Elective Courses under the Background of Big Data

Table 1

Course.

Field name	Field type	Primary key	Is it empty	Definition
Id	Int	Pri	No	Auto_increment
course_number	Varchar (20)	No	Yes
Title	Varchar (30)	No	No
Teacher	Varchar (20)	No	No
Info	Varchar (500)	No	Yes
Course_studentno	Varchar (20)	No	Yes

Table description: the id number of the id course is unique. It uses the int type and is the primary key of the table. It cannot be empty. Auto_increment is the realization of automatic growth.