SQL_202
找出所有员工当前薪水salary情况
https://www.nowcoder.com/practice/ae51e6d057c94f6d891735a48d1c2397
方法一：
思路：对工资去重，降序
代码：
select distinct salary from salaries where to_date='9999-01-01' order by salary desc
方法二：
思路：用 group By 去重对工资去重，再降序。 group by 去重的性能高于 distinct
代码：
select salary from salaries where to_date='9999-01-01' group by salary order by salary desc;
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