如何使用PL / SQL模拟相关子查询？

Question

我在部门内选择高于平均水平的工资

SELECT employee_id, first_name|| ' ' ||last_name as Name, salary, department_id
FROM EMPLOYEES o
WHERE SALARY >
  (SELECT AVG(salary) FROM EMPLOYEES i
     WHERE i.department_id=o.department_id);

如何在不使用子查询的情况下在PLSQL中重写此查询？

Answer 1

我不知道你是否想要代码，但首先，我告诉你需要采取的步骤。

 - Create a cursor for the main query
 - Create a loop to navigate that cursor
 - Execute the select avg and save the result in a variable.
 - Make an IF to compare
 - Output / save the result