ProgressDialog 继承自AlertDialog,AlertDialog继承自Dialog public class ProgressDialog extends ...
ProgressDialog 继承自AlertDialog,AlertDialog继承自Dialog public class ProgressDialog extends ...
create table student(
id mediumint auto_increment comment '主键id',
name varchar(30) comment '姓名',
age smallint comment '年龄',
primary key(id)
)
engine = myisam,
charset = utf8,
comment = '学生'
课程表:course
create table course(
id mediumint auto_increment comment '主键id',
name varchar(30) comment '课程名称',
primary key(id)
)
engine = myisam,
charset = utf8,
comment = '课程'
学生课程表:stu_cour
create table IF NOT EXISTS stu_cour(
stu_id mediumint comment '学生表id',
cour_id mediumint comment '课程表id',
primary key(stu_id ,cour_id )
)
engine = myisam,
charset = utf8,
comment = '学生课程表'
楼主,这算联合还是复合
mysql的联合主键与复合主键区别复合主键就是指你表的主键含有一个以上的字段组成 。 例如; create table test ( name varchar(19), id number, value va...