Help needed to build delete statement

i need to keep last 10 days data+ last day of everymonth data in my table.
this table will grow on daily basis.
ex:
data_date no.of records
2006/02/28 10000
2006/03/31 11000
2006/04/30 12000
2006/05/31 13000
2006/06/09     13100
2006/06/10 13200
2006/06/11 13300
2006/06/12 13400
2006/06/13     13500
2006/06/14     13600
2006/06/15 13700
2006/06/16 13800
2006/06/17     13900
2006/06/18     14000
means last 10 days + last day of evermonth data need to store and remaining all
records i need to delete from this table.
could you help me to build this delete statement in single statement.

select * from mytbl;
DD                 NR
28-02-2006      12000
31-03-2006      10000
30-04-2006      12050
31-05-2006       9500
06-06-2006      13100
07-06-2006      13200
08-06-2006      13300
09-06-2006      13400
10-06-2006      13500
11-06-2006      13600
12-06-2006      13700
13-06-2006      13800
14-06-2006      13900
15-06-2006      14000
16-06-2006      14100
17-06-2006      14200
18-06-2006      14300
17 rows selected.
delete from mytbl
where not
( dd = last_day( dd ) -- Keep last days of months
   or dd >= trunc(sysdate) - 10 -- Keep last 10 days
3 rows deleted.
select * from mytbl;
DD                 NR
28-02-2006      12000
31-03-2006      10000
30-04-2006      12050
31-05-2006       9500
09-06-2006      13400
10-06-2006      13500
11-06-2006      13600
12-06-2006      13700
13-06-2006      13800
14-06-2006      13900
15-06-2006      14000
16-06-2006      14100
17-06-2006      14200
18-06-2006      14300To me...it looks like it does work!

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Help needed in building query

Tab1
Parent       Child       sa l
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A1     B       4000
A     X       1000
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This is not so simple since it is not really clear in your data set whether the sal belongs to the parent or to the child. I assume it's the salary of the child, in which case the salary of P1 is missing. The best option is to fix the data model and have two tables: one containing the element and sal, and another table containing just the relationships. To fix this issue I introduced a dummy record for P1 and salary 0.
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If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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