分析函数sum() over (order by ) 使用记录
环境:oracle 10.2.0.1.0
用户:scott / tiger
分析函数sum() over (order by ) 使用记录:
SQL> select ename,sal,sum(sal) over(order by sal,empno) from emp order by 2;
ENAME SAL SUM(SAL)OVER(ORDERBYSAL,EMPNO)
---------- --------- ------------------------------
SMITH 800.00 800
JAMES 950.00 1750
ADAMS 1100.00 2850
WARD 1250.00 4100
MARTIN 1250.00 5350
MILLER 1300.00 6650
TURNER 1500.00 8150
ALLEN 1600.00 9750
CLARK 2450.00 12200
BLAKE 2850.00 15050
JONES 2975.00 18025
SCOTT 3000.00 21025
FORD 3000.00 24025
KING 5000.00 29025
14 rows selected
第二种方法:
SQL> select ename,sal,(select sum(d.sal) from emp d where d.empno<=e.empno) from emp e order by 3;
ENAME SAL (SELECTSUM(D.SAL)FROMEMPDWHERE
---------- --------- ------------------------------
SMITH 800.00 800
ALLEN 1600.00 2400
WARD 1250.00 3650
JONES 2975.00 6625
MARTIN 1250.00 7875
BLAKE 2850.00 10725
CLARK 2450.00 13175
SCOTT 3000.00 16175
KING 5000.00 21175
TURNER 1500.00 22675
ADAMS 1100.00 23775
JAMES 950.00 24725
FORD 3000.00 27725
MILLER 1300.00 29025
14 rows selected
其他: total2 列示意了存在重复值时可能带来的问题.
SQL> select ename,sal,sum(sal) over(order by sal,empno) as total1,sum(sal) over(order by sal)as total2 from emp order by 2;
ENAME SAL TOTAL1 TOTAL2
---------- --------- ---------- ----------
SMITH 800.00 800 800
JAMES 950.00 1750 1750
ADAMS 1100.00 2850 2850
WARD 1250.00 4100 5350
MARTIN 1250.00 5350 5350
MILLER 1300.00 6650 6650
TURNER 1500.00 8150 8150
ALLEN 1600.00 9750 9750
CLARK 2450.00 12200 12200
BLAKE 2850.00 15050 15050
JONES 2975.00 18025 18025
SCOTT 3000.00 21025 24025
FORD 3000.00 24025 24025
KING 5000.00 29025 29025
14 rows selected
在over()内partition by 使用与不使用的区别显示：
SQL> select deptno,ename,sal,sum(sal) over(order by sal,empno) from emp ;
DEPTNO ENAME SAL SUM(SAL)OVER(ORDERBYSAL,EMPNO)
------ ---------- --------- ------------------------------
20 SMITH 800.00 800
30 JAMES 950.00 1750
20 ADAMS 1100.00 2850
30 WARD 1250.00 4100
30 MARTIN 1250.00 5350
10 MILLER 1300.00 6650
30 TURNER 1500.00 8150
30 ALLEN 1600.00 9750
10 CLARK 2450.00 12200
30 BLAKE 2850.00 15050
20 JONES 2975.00 18025
20 SCOTT 3000.00 21025
20 FORD 3000.00 24025
10 KING 5000.00 29025
14 rows selected
SQL> select deptno,ename,sal,sum(sal) over(partition by deptno order by sal,empno) from emp ;
DEPTNO ENAME SAL SUM(SAL)OVER(PARTITIONBYDEPTNO
------ ---------- --------- ------------------------------
10 MILLER 1300.00 1300
10 CLARK 2450.00 3750
10 KING 5000.00 8750
20 SMITH 800.00 800
20 ADAMS 1100.00 1900
20 JONES 2975.00 4875
20 SCOTT 3000.00 7875
20 FORD 3000.00 10875
30 JAMES 950.00 950
30 WARD 1250.00 2200
30 MARTIN 1250.00 3450
30 TURNER 1500.00 4950
30 ALLEN 1600.00 6550
30 BLAKE 2850.00 9400
14 rows selected