题解 | #查询结果去重#
查询结果去重
https://www.nowcoder.com/practice/82ebd89f12cf48efba0fecb392e193dd
select distinct university from user_profile #43 6508
select university from user_profile group BY university 47 6524
一: 很明显,根据distinct去重时间更快
二: 用group by分组时间和内存更高大一些,但也能用分组给数据进行去重