MySQL笔记之基本查询的应用分析

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参考表：student

多字段查询

代码如下:

mysql> select id,name,birth from student;

所有字段查询

代码如下:

mysql> select * from student;

where指定查询

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

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

代码如下:

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

between and指定范围查询

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

代码如下:

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

like字符串匹配查询

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

代码如下:

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

null查询

代码如下:

mysql> select * from student where address is null;

and多条件查询

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

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

代码如下:

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

order by查询结果排序

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

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

代码如下:

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

limit限制查询结果数量

代码如下:

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

 

 

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关键词：MYSQL