Как найти тройку самых высоких зарплат в таблице emp в оракуле?

Question

Как найти тройку самых высоких зарплат в таблице emp в оракуле?

Answer 1

select top 3 * from emp  order by sal desc

Answer 2

Select ename, job, sal from emp
    where sal >=(select max(sal) from emp
    where sal < (select max(sal) from emp
    where sal < (select max(sal) from emp)))
    order by sal;

ENAME      JOB              SAL
---------- --------- ----------
KING       PRESIDENT       5000
FORD       ANALYST         3000
SCOTT      ANALYST         3000

Answer 3

 SELECT * FROM 
     (
      SELECT EMPLOYEE, LAST_NAME, SALARY,
      DENSE_RANK() OVER (ORDER BY SALARY DESC) EMPRANK
      FROM emp
     )
    WHERE emprank <= 3;

Answer 4

SELECT salary,first_name||' '||last_name "Name of the employee" 
FROM hr.employees 
WHERE rownum <= 3 
ORDER BY salary desc ;

Answer 5

Ограничение запроса для отображения только трех самых высокооплачиваемых сотрудников. : Запрос «Oracle PL / SQL

create table employee(
         emp_no                 integer         primary key
        ,lastname               varchar2(20)    not null
        ,salary                 number(3)
);

insert into employee(emp_no,lastname,salary)
              values(1,'Tomy',2);

insert into employee(emp_no,lastname,salary)
              values(2,'Jacky',3);

insert into employee(emp_no,lastname,salary)
              values(3,'Joey',4);

insert into employee(emp_no,lastname,salary)
              values(4,'Janey',5);


select lastname,  salary
from (SELECT lastname, salary FROM employee ORDER BY salary DESC)
where rownum <= 3 ;

OUTPUT

LASTNAME                 SALARY

-------------------- ----------
Janey                         5

Joey                          4

Jacky                         3

drop table employee;

Answer 6

Вы можете использовать DBMS_STAT_FUNCS.Summary:

SET SERVEROUTPUT ON;
DECLARE
    s DBMS_STAT_FUNCS.SummaryType;
BEGIN
    DBMS_STAT_FUNCS.SUMMARY('HR', 'EMPLOYEES', 'SALARY',3, s);
    DBMS_OUTPUT.put_line('Top 3: ' || s.top_5_values(1) || '-' 
                         || s.top_5_values(2) || '-' || s.top_5_values(3));
END;
/

Выход:

Top 3: 24000-17000-17000

Answer 7

    select empno,salary from emp e
     where 3 > ( Select count(salary) from emp
      where e.salary < salary )


Another way :

    select * from
    (
    select empno,salary,
    Rank() over(order by salary desc) as rank from emp )
    where Rank <= 3;

Another Way :

    select * from
    (
    select empno,salary from emp
    order by salary desc
    )
    where rownum <= 3;