SQL语句入门

1、数据库

创建数据库：CREATE DATABASE student_teacher;

删除数据库：DROP DATABASE student_teacher;

切换到当前数据库：USE student_teacher;

2、表

创建表：CREATE TABLE student;

删除表：DROP TABLE student;

增加一列：Alter table student add column name char;

3、视图

创建视图：create view stu;

删除视图：drop view stu;

4、简单表数据操作语句

选择：select * from student where no=091120109;

插入元组：insert into student（no,num,sex,grade） values(1,091120109,male,98);

删除元组：delete form student where sex=male;

更新字段属性的值：update student set sex=female where sex=male;

模糊查找：select * from student where num like “%911201%”; //%代表任意的零个或多个字符，’_’表示任意单个字符。

排序（DESC为降序，ASC为升序）：select *from student order by num [DESC];