Question

我想将Subquery转换为Join，以下是子查询

SELECT employee_id, last_name, salary
FROM employees
WHERE salary > (SELECT AVG(salary)
FROM employees);

我写了以下加入，但我得到＆＃34; ORA-00934：这里不允许组功能＆＃34;错误

SELECT e.employee_id,
  e.last_name,
  e.salary
FROM employees e
INNER JOIN employees average
ON(e.salary>AVG(average.salary));

Answer 1

你可以像

一样使用它

SELECT e.employee_id,
  e.last_name,
  e.salary
FROM employees e
INNER JOIN (select AVG(salary) salary from employees ) average
ON (e.salary > average.salary)
Group by e.employee_id;

如何在自联接中使用组功能？

1 个答案: