题解 | #查找字符串 10,A,B 中逗号,出现的次数cnt#
查找排除当前最大、最小salary之后的员工的平均工资avg_salary
http://www.nowcoder.com/practice/95078e5e1fba4438b85d9f11240bc591
select avg(salary) avg_salary
from salaries
where to_date='9999-01-01' and salary not in(
(select min(salary)
from salaries
where to_date='9999-01-01'),
(SELECT max(salary)
from salaries
where to_date='9999-01-01')
)
group by to_date;
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