bitsCN.com
参考表:student

mysql> select id,name,birth from student;
mysql> select * from student;
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';
mysql> select * from student where birth in(1988,1990);mysql> select * from student where id in(903,906);
mysql> select * from student where birth not in(1990,1998);
mysql> select * from student where birth between 1986 and 1988;
mysql> select * from student where id not between 904 and 906;
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%';
mysql> select * from student where name not like '张%';
mysql> select * from student where address is null;
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';
mysql> select * from student where id=905 or birth=1988;mysql> select * from student where id=905 or birth=1988 or sex='女';
mysql> select distinct sex from student;mysql> select distinct department from student;
mysql> select * from student order by birth;mysql> select * from student order by birth asc;mysql> select * from student order by birth desc;
mysql> select sex,group_concat(name) from student group by sex;mysql> select sex,count(name) from student group by sex;
mysql> select * from student limit 2;mysql> select * from student limit 1,3;
bitsCN.com
每个人都需要一台速度更快、更稳定的 PC。随着时间的推移,垃圾文件、旧注册表数据和不必要的后台进程会占用资源并降低性能。幸运的是,许多工具可以让 Windows 保持平稳运行。
Copyright 2014-2025 https://www.php.cn/ All Rights Reserved | php.cn | 湘ICP备2023035733号