数据分级显示并且行转列

ENAME				      SAL
------------------------------ ----------
SMITH				      800
ALLEN				     1600
WARD				     1250
JONES				     2975
MARTIN				     1250
BLAKE				     2850
CLARK				     2450
SCOTT				     3000
KING				     5000
TURNER				     1500
ADAMS				     1100
JAMES				      950
FORD				     3000
MILLER				     1300

---------------     ---------------     ---------------
KING(5000)	    BLAKE(2850)	    TURNER(1500)
FORD(3000)	    CLARK(2450)	    MILLER(1300)
SCOTT(3000)	    ALLEN(1600)	    WARD(1250)
JONES(2975)			    MARTIN(1250)
ADAMS(1100)
JAMES(950)
SMITH(800)

SELECT MAX(CASE
WHEN grp = 1 THEN
ename || '(' || sal || ')'
END) AS lv1,
MAX(CASE
WHEN grp = 2 THEN
ename || '(' || sal || ')'
END) AS lv2,
MAX(CASE
WHEN grp = 3 THEN
ename || '(' || sal || ')'
END) AS lv3
FROM (SELECT ename,
sal,
/* 生成分组依据*/
CASE
WHEN rn <= 3 THEN
1
WHEN rn <= 6 THEN
2
ELSE
3
END AS grp,
/*生成分组的序列*/
row_number() over(PARTITION BY(CASE
WHEN rn <= 3 THEN
1
WHEN rn <= 6 THEN
2
ELSE
3
END) ORDER BY sal DESC) AS rn
FROM (SELECT ename, sal,
/* 使用dense_rank生成序列号，并列的重复显示 */
dense_rank() over(ORDER BY sal DESC) rn
FROM emp))
GROUP BY rn
ORDER BY rn
/

SQL> col lv1 for a15;
SQL> col lv2 for a15;
SQL> col lv3 for a15;
SQL> /

LV1		    LV2		        LV3
---------------     ---------------     ---------------
KING(5000)	    BLAKE(2850)	        TURNER(1500)
FORD(3000)	    CLARK(2450)	        MILLER(1300)
SCOTT(3000)	    ALLEN(1600)	        WARD(1250)
JONES(2975)			        MARTIN(1250)
ADAMS(1100)
JAMES(950)
SMITH(800)

7 rows selected.