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;