mysql OldGuo实战师徒班

创建表create tablestudent(idint,namevarchar(20),sexvarchar(20),ageint,saleryfloat(6,2),birthday date)//删除表drop table student;//查看所有表show tables//查看表的创建细节show create table student;//展示表结构desc student// 在原有的学生基础上添加address列alter table student add