MySQL笔记之基本查询的应用详解

有时候阳光很好,有时候阳光很暗,这就是生活。不就应迫求一切种类的快乐,就应只追求高尚的快乐。

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;


本文MySQL笔记之基本查询的应用详解到此结束。没有音乐,生活是一种遗憾,没有爱心,生命是一种多佘。小编再次感谢大家对我们的支持!

您可能有感兴趣的文章
centos7安装MySQL教程

MySQL常用SQL查询语句(含复杂SQL查询)

MySQL细数发生索引失效的情况

mysqlenum字段类型的谨慎如何使用

Mysql体系化探讨令人头疼的JOIN运算