有關MySQL查詢語句的練習

1. 先建立一個表，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. 在該表中插入數據

mysql> insert student(no,name,sex,birthday,class) values('105','張三','女','1987-9-2 00:00:00','123');

Query OK, 1 row affected (0.00 sec)

【切記：如果再插入是無法識別中文則——sex names gbk；也是編碼的問題】

1. 以該表數據中的class字段降序輸出

mysql> select * from student order by class desc;

1. 列出該表中class字段不重複的部分（關鍵字：distinct）

mysql> select distinct class from student;

1. 列出該表中的字段no、name、sex

mysql> select no,name,sex from student;

1. 輸出該表中不姓小的名字

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

1. 在該表中添加degree字段

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

、

1. 給該字段下的每一條記錄添加數據

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

1. 給該字段degree同時添加一個數字

mysql> update student set degree=degree+1;

1. 輸出成績爲99或者在60-70之間

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

1. 輸出班級爲123或者性別爲女的同學

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

1. 輸出一個班級爲123或者性別爲女的同學的姓名

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

1. 以升序輸出degree的所有記錄

mysql> select * from student order by degree;

1. 輸出男生人數和男生所在班級的數量

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

1. 列出存在85分以上的課程號

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