有关MySQL查询语句的练习

1. 先建立一个表，表的字段包括：no、name、sex、birthday、class

mysql> create table student(

    -> no varchar(20) primary key,

    -> name varchar(20) not null,

    -> sex varchar(20) not null,

    -> birthday datetime not null unique key,

    -> class varchar(20) not null);

Query OK, 0 rows affected (0.01 sec)

1. 在该表中插入数据

mysql> insert student(no,name,sex,birthday,class) values('105','张三','女','1987-9-2 00:00:00','123');

Query OK, 1 row affected (0.00 sec)

【切记：如果再插入是无法识别中文则——sex names gbk；也是编码的问题】

1. 以该表数据中的class字段降序输出

mysql> select * from student order by class desc;

1. 列出该表中class字段不重复的部分（关键字：distinct）

mysql> select distinct class from student;

1. 列出该表中的字段no、name、sex

mysql> select no,name,sex from student;

1. 输出该表中不姓小的名字

mysql> select name from student where name not like '小%';

1. 在该表中添加degree字段

mysql> alter table student add degree int not null after class;

、

1. 给该字段下的每一条记录添加数据

mysql> update student set degree=degree+65 where no='105';

1. 给该字段degree同时添加一个数字

mysql> update student set degree=degree+1;

1. 输出成绩为99或者在60-70之间

mysql> select * from student where degree=99 or degree between 60 and 70;

1. 输出班级为123或者性别为女的同学

mysql> select * from student where class='123' or sex='女';

1. 输出一个班级为123或者性别为女的同学的姓名

mysql> select name from student where class='123' or sex='女';

1. 以升序输出degree的所有记录

mysql> select * from student order by degree;

1. 输出男生人数和男生所在班级的数量

mysql> select COUNT(*),COUNT(DISTINCT class) from student where sex='女';

1. 列出存在85分以上的课程号

mysql> select distinct no from student where degree>85;