Oracle並列排名顯示

第一種:dense_rank() over (order  by  字段  升序或降序)  as  別名  from 表名;
使用別名方便以後過濾條件使用;

排名的時候並列算同一我的,如,1,2,2,3

SQL> select ename,job,sal,dense_rank() over(order by sal desc) as rank from emp;
 
ENAME      JOB              SAL       RANK
---------- --------- ---------- ----------
KING       PRESIDENT       5000          1
FORD       ANALYST         3000          2
SCOTT      ANALYST         3000          2
JONES      MANAGER         2975          3
BLAKE      MANAGER         2850          4
CLARK      MANAGER         2450          5
ALLEN      SALESMAN        1600          6
TURNER     SALESMAN        1500          7
ADAMS      CLERK           1400          8
SMITH      CLERK           1400          8
MILLER     CLERK           1300          9
WARD       SALESMAN        1250         10
MARTIN     SALESMAN        1250         10
JAMES      CLERK            950         11
 
已選擇14行。
好比限制條件爲 排名第二的員工,並列的都顯示出來:
SQL> select * from (select ename,job,sal,dense_rank() over(order by sal desc) as rank from emp) where rank =2;
 
ENAME      JOB              SAL       RANK
---------- --------- ---------- ----------
SCOTT      ANALYST         3000          2
FORD       ANALYST         3000          2
 
第二種:rank() over (order  by  字段名  升序或者降序) as  別名  from 表名;
排名的時候,並列多少我的,序號就算多少個,如:1,2,2,4

SQL> select ename,job,sal,rank() over(order by sal desc) as rank from emp;
 
ENAME      JOB              SAL       RANK
---------- --------- ---------- ----------
KING       PRESIDENT       5000          1
FORD       ANALYST         3000          2
SCOTT      ANALYST         3000          2
JONES      MANAGER         2975          4
BLAKE      MANAGER         2850          5
CLARK      MANAGER         2450          6
ALLEN      SALESMAN        1600          7
TURNER     SALESMAN        1500          8
ADAMS      CLERK           1400          9
SMITH      CLERK           1400          9
MILLER     CLERK           1300         11
WARD       SALESMAN        1250         12
MARTIN     SALESMAN        1250         12
JAMES      CLERK            950         14
 
已選擇14行。
第三種:row_number() over (order by  字段名  升序或降序)  as  別名  from 表名;
這種就是不分並列,直接按序號來排名,如:1,2,3,4

SQL> select ename,job,sal,row_number() over(order by sal desc) as rank from emp;
 
ENAME      JOB              SAL       RANK
---------- --------- ---------- ----------
KING       PRESIDENT       5000          1
FORD       ANALYST         3000          2
SCOTT      ANALYST         3000          3
JONES      MANAGER         2975          4
BLAKE      MANAGER         2850          5
CLARK      MANAGER         2450          6
ALLEN      SALESMAN        1600          7
TURNER     SALESMAN        1500          8
ADAMS      CLERK           1400          9
SMITH      CLERK           1400         10
MILLER     CLERK           1300         11
WARD       SALESMAN        1250         12
MARTIN     SALESMAN        1250         13
JAMES      CLERK            950         14
 
已選擇14行。

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原文連接:https://blog.csdn.net/WXB52112181314/article/details/80838567
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