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[Oracle]¸ßЧµÄSQLÓï¾äÖ®·ÖÎöº¯Êý(Ò»)--sum()
[Oracle]¸ßЧµÄSQLÓï¾äÖ®·ÖÎöº¯Êý(¶þ)--max()
[Oracle]¸ßЧµÄSQLÓï¾äÖ®·ÖÎöº¯Êý(Èý)--row_number() /rank()/dense_rank()
[Oracle]¸ßЧµÄSQLÓï¾äÖ®·ÖÎöº¯Êý(ËÄ)--lag()/lead()
ʵ¼ÊÓ¦ÓÃÖÐÎÒÃÇ¿ÉÒÔͨ¹ýsum()ͳ¼Æ³ö×éÖеÄ×ܼƻòÕßÊÇÀÛ¼ÓÖµ£¬¾ßÌåʾÀýÈçÏ£º
1.´´½¨ÑÝʾ±í
create table emp
as
select * from scott.emp;
alter table emp
add constraint emp_pk
primary key(empno);
create table dept
as
select * from scott.dept;
alter table dept
add constraint dept_pk
primary key(deptno);
2. sum()Óï¾äÈçÏ£º
select deptno,
       ename,
       sal,
¡¡¡¡--°´ÕÕ²¿ÃÅнˮÀÛ¼Ó£¨order by¸Ä±äÁË·ÖÎöº¯ÊýµÄ×÷Óã¬Ö»¹¤×÷ÔÚµ±Ç°ÐкÍǰһÐУ¬¶ø²»ÊÇËùÓÐÐУ©
       sum(sal) over (partition by deptno order by sal) CumDeptTot,  
       sum(sal) over (partition by deptno) SalByDept,  --ͳ¼ÆÒ»¸ö²¿ÃŵÄнˮ
       sum(sal) over (order by deptno,sal) CumTot,  --ËùÓйÍÔ±µÄнˮһÐÐÒ»ÐеÄÀÛ¼Ó
       sum(sal) over () TotSal  --ͳ¼Æ×Üнˮ
  from emp
 order by deptno, sal
3. ½á¹ûÈçÏ£º
10    MILLER    1300.00    1300    8750    1300    29025
10    CLARK    2450.00    3750    8750    3750    29025
10    KING    5000.00    8750    8750 


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