select empno, ename, job, sal from emp;

EMPNO ENAME      JOB             SAL
----- ---------- --------- ---------
 7369 SMITH      CLERK        800.00
 7499 ALLEN      SALESMAN    1600.00
 7521 WARD       SALESMAN    1250.00
 7566 JONES      MANAGER     2975.00
 7654 MARTIN     SALESMAN    1250.00
 7698 BLAKE      MANAGER     2850.00
 7782 CLARK      MANAGER     2450.00
 7788 SCOTT      ANALYST     3000.00
 7839 KING       PRESIDENT   5000.00
 7844 TURNER     SALESMAN    1500.00
 7876 ADAMS      CLERK       1100.00
 7900 JAMES      CLERK        950.00
 7902 FORD       ANALYST     3000.00
 7934 MILLER     CLERK       1300.00
 
14 rows selected



select empno, ename, job, sal
  from (select t.*, rownum as rn, row_number() over(order by sal desc) as rs from emp t)
 order by case when rs <= 3 then 0 else rn end;

EMPNO ENAME      JOB             SAL
----- ---------- --------- ---------
 7839 KING       PRESIDENT   5000.00
 7902 FORD       ANALYST     3000.00
 7788 SCOTT      ANALYST     3000.00
 7369 SMITH      CLERK        800.00
 7499 ALLEN      SALESMAN    1600.00
 7521 WARD       SALESMAN    1250.00
 7566 JONES      MANAGER     2975.00
 7654 MARTIN     SALESMAN    1250.00
 7698 BLAKE      MANAGER     2850.00
 7782 CLARK      MANAGER     2450.00
 7844 TURNER     SALESMAN    1500.00
 7876 ADAMS      CLERK       1100.00
 7900 JAMES      CLERK        950.00
 7934 MILLER     CLERK       1300.00
 
14 rows selected

------解决方案--------------------
用工资倒序排序,找出前三名. 再用union all并上去掉前三的其他人.
不知道这样可以不, union all不再排序就没事

------解决方案--------------------
SQL code

with tb1 as
(
     select 1 as id,3000 as sal from dual
     union all
     select 2 as id,2000 as sal from dual
     union all
     select 3 as id,4000 as sal from dual
     union all
     select 4 as id,5000 as sal from dual
     union all
     select 5 as id,7000 as sal from dual
     union all
     select 6 as id,6000 as sal from dual
)
select id,sal from (select id,sal,row_number() over(order by sal desc) as rn from tb1) t where t.rn<=3
union all
(select id,sal from tb1
minus
select id,sal from (select id,sal,row_number() over(order by sal desc) as rn from tb1) t where t.rn<=3);

------解决方案--------------------
探讨

SQL code


select empno, ename, job, sal from emp;

EMPNO ENAME      JOB             SAL
----- ---------- --------- ---------
 7369 SMITH      CLERK        800.00
 7499 ALLEN      SALESMAN    ……


------解决方案--------------------
查询公司员工表的所有信息，工资最高的前三名员工在查询的最前面，其他的不变。


-- 猪才会出这样的题目！