欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

MySQL笔记之基本查询的应用详解

程序员文章站 2024-02-19 12:40:10
参考表:student 多字段查询复制代码 代码如下:mysql> select id,name,birth from student;所有字段查询复制代码 代码如...

参考表:student

MySQL笔记之基本查询的应用详解

多字段查询

复制代码 代码如下:

mysql> select id,name,birth from student;


所有字段查询
复制代码 代码如下:

mysql> select * from student;


where指定查询
复制代码 代码如下:

mysql> select * from student where id=901;
mysql> select * from student where id>=904;
mysql> select name from student where department='计算机系';


in指定集合查询
复制代码 代码如下:

mysql> select * from student where birth in(1988,1990);
mysql> select * from student where id in(903,906);

not in非范围查询
复制代码 代码如下:

mysql> select * from student where birth not in(1990,1998);


between and指定范围查询
复制代码 代码如下:

mysql> select * from student where birth between 1986 and 1988;


not between and不在指定范围的查询
复制代码 代码如下:

mysql> select * from student where id not between 904 and 906;


like字符串匹配查询
复制代码 代码如下:

mysql> select * from student where name like '_三';
mysql> select * from student where name like '张三';
mysql> select * from student where name like '张%';


not like不匹配查询
复制代码 代码如下:

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


null查询
复制代码 代码如下:

mysql> select * from student where address is null;


and多条件查询
复制代码 代码如下:

mysql> select * from student where name like '张%' and birth>1985;
mysql> select * from student where name like '张%' and birth>1985 and id like '%3';


or多条件查询
复制代码 代码如下:

mysql> select * from student where id=905 or birth=1988;
mysql> select * from student where id=905 or birth=1988 or sex='女';

distinct查询结果不重复

复制代码 代码如下:

mysql> select distinct sex from student;
mysql> select distinct department from student;


order by查询结果排序
复制代码 代码如下:

mysql> select * from student order by birth;
mysql> select * from student order by birth asc;
mysql> select * from student order by birth desc;


group by分组查询
复制代码 代码如下:

mysql> select sex,group_concat(name) from student group by sex;
mysql> select sex,count(name) from student group by sex;


正则表达式查询
复制代码 代码如下:

mysql> select * from student where birth regexp '1988|1990';


limit限制查询结果数量
复制代码 代码如下:

mysql> select * from student limit 2;
mysql> select * from student limit 1,3;