今天上课我们进行了对数据的归一化操作:
先用sql查询数据的最大值和最小值:
select min(sum) from cph1_copy1;
select max(pingjun) from cph1_copy1;
然后用sql语句进行数据的归一化:
select id,(sum-min(sum))/(max(sum)-min(sum)) from cph1_copy1;
![](https://www.icode9.com/i/l/?n=22&i=blog/2090416/202204/2090416-20220401152308513-63079641.png)
标签:4.1,min,copy1,sum,归一化,cph1,select
来源: https://www.cnblogs.com/wrljzb/p/16087181.html