不確定我是否理解正確，但這可能是你想要的。但可能性能欠佳。

12:32:22 HR@vm_xe> l

1 with player(id, dt) as (

2 select 1, date '2012-01-01' from dual union all

3 select 2, date '2012-01-01' from dual union all

4 select 3, date '2012-01-02' from dual union all

5 select 4, date '2012-01-03' from dual union all

6 select 5, date '2012-01-04' from dual union all

7 select 6, date '2012-01-05' from dual union all

8 select 7, date '2012-01-06' from dual union all

9 select 8, date '2012-01-07' from dual union all

10 select 9, date '2012-01-08' from dual union all

11 select 10, date '2012-01-09' from dual union all

12 select 11, date '2012-01-10' from dual

13 )

14 select distinct

15 to_char(dt, 'dd-mm-yyyy') dt

16 ,count(*) over (order by trunc(dt) range interval '7' day preceding) week_cnt

17 from player

18* order by 1, 2

12:32:22 HR@vm_xe> /

DT WEEK_CNT

---------- ----------

01-01-2012 2

02-01-2012 3

03-01-2012 4

04-01-2012 5

05-01-2012 6

06-01-2012 7

07-01-2012 8

08-01-2012 9

09-01-2012 8

10-01-2012 8

10 rows selected.

Elapsed: 00:00:00.01附：不要像代碼那樣

(To_Date('2012-sep-03','yyyy-mon-dd')-Trunc(Init_Dtime))<=7代碼就像

init_time between to_date('2012-SEP-03', 'yyyy-mon-dd') and to_date('2012-SEP-03', 'yyyy-mon-dd') + 7除非你不關(guān)心索引，當(dāng)然:)

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