mysql脚本

1.mysql 中分解IP的查询语句：

select substring_index(substring_index(y.ip, '.',1), '.', -1) a,

     substring_index(substring_index(y.ip, '.',2), '.', -1) b,

     substring_index(substring_index(y.ip, '.',3), '.', -1) c,

     substring_index(substring_index(y.ip, '.',4), '.', -1) d

from (select '127.0.0.1' as ip from t1)y

 

2. 找到包含最大值和最小值的记录

 select ename 

from emp

where sal in((select min(sal) from emp),

(select max(sal) from emp));