MySQL学习笔记7：基本查询

参考表：student

 

多字段查询

mysql> select id,name,birth from student;

 

所有字段查询

mysql> select * from student;

 

where指定查询

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

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

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

 

between and指定范围查询

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

 

not between and不在指定范围的查询

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

 

like字符串匹配查询

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

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

 

null查询

mysql> select * from student where address is null;

 

and多条件查询

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

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

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

 

order by查询结果排序

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

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

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

 

limit限制查询结果数量

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