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我对两个查询有疑问。这两个查询会给出相同的结果吗?我试图通过部门找到平均工资:来自Lynda.com的SQL查询
Select s1.department, avg(s1.salary)
From
(Select department, salary
From staff
Where salary > 100000) s1
Group by s1.department
VS
select department, avg(salary) as avg_salary
from staff
where salary > 100000
group by department
您使用的RDBMS是什么? MySQL,SQL服务器?不清楚你问什么。您可以运行查询并查看他们的结果是否相同 – Artem