Increment week (Date problem)

Question

Guys,
I have a table that holds item and week_nr. I'll have 3 input parameters 1-item, 2-week_start, 3-week_end. My requirement is to insert records into the table with ercord holding week_nr from week_start to week_end.
This is what I've tried so far.
For eg:
SQL> desc table1
Name                                                  Null?    Type
ITEM                                                           VARCHAR2(10)
WEEK_NR                                                        NUMBER
SQL>
SQL> drop table table1
  2  /
Table dropped.
SQL>
SQL> create table table1(item varchar2(10), week_nr number)
  2  /
Table created.
SQL>
SQL> create or replace procedure sample_proc(p_item varchar2,
  2                                          p_wk_start number,
  3                                          p_wk_end number)
  4  is
  5  begin
  6     insert into table1 select p_item,
  7                               p_wk_start + rownum - 1
  8                        from user_objects
  9                        where rownum <= (p_wk_end - p_wk_start) +1;
10     commit;
11  end;
12  /
Procedure created.
SQL>
SQL> begin
  2     sample_proc('item1', '200624', '200628');
  3  end;
  4  /
PL/SQL procedure successfully completed.
SQL>
SQL> select * from table1
  2  /
ITEM          WEEK_NR
item1          200624
item1          200625
item1          200626
item1          200627
item1          200628
SQL>Fine so far.. But when the week_nr reaches 52, for the next increment, it has to increment the year and then make the week to 01. For eg from 200652 it should go to 200701 and so....
SQL> begin
  2     sample_proc('item2', '200650', '200702');
  3  end;
  4  /
PL/SQL procedure successfully completed.
SQL> select count(*) from table1
  2  /
  COUNT(*)
        58
SQL> which is not the expected.
I don't know if anything can be done using the built-in date function with 'WW' date format. I've tried WW data format, but couldn't succeed.
Could you guys provide me a SQL solution for this?
Cheers
Sarma.

Answer 1

Something like this?
SQL> create table table1(item varchar2(10), week_nr number)  ;
Table created.
SQL> create or replace procedure sample_proc(p_item varchar2,
  2                                          p_wk_start number,
  3                                          p_wk_end number)
  4  is
  5  begin
  6  IF substr(p_wk_end,1,4) < substr(p_wk_start,1,4)
  7  then
  8  insert into table1
  9  select p_item,p_wk_start + rownum - 1  from user_objects
10  where rownum <= (p_wk_end - p_wk_start) +1;
11  else
12  insert into table1
13  select p_item,p_wk_start + rownum - 1  from user_objects
14  where rownum <= (substr(p_wk_start,1,4)||52-p_wk_start) +1;
15  insert into table1
16  select p_item,to_number(substr(p_wk_end,1,4)||'01') + rownum - 1  from user_objects
17  where rownum <= (p_wk_end-to_number(substr(p_wk_end,1,4)||'01')) +1;
18  end if;
19  commit;
20  end;
21  /
Procedure created.
SQL> begin
  2  sample_proc('item2', '200604', '200712');
  3  end;
  4  /
PL/SQL procedure successfully completed.
SQL> select * from table1;
ITEM          WEEK_NR
item2          200604
item2          200605
item2          200606
item2          200607
item2          200608
item2          200609
item2          200610
item2          200611
item2          200612
item2          200613
item2          200614
ITEM          WEEK_NR
item2          200615
item2          200616
item2          200617
item2          200618
item2          200619
item2          200620
item2          200621
item2          200622
item2          200623
item2          200624
item2          200625
ITEM          WEEK_NR
item2          200626
item2          200627
item2          200628
item2          200629
item2          200630
item2          200631
item2          200632
item2          200633
item2          200634
item2          200635
item2          200636
ITEM          WEEK_NR
item2          200637
item2          200638
item2          200639
item2          200640
item2          200641
item2          200642
item2          200643
item2          200644
item2          200645
item2          200646
item2          200647
ITEM          WEEK_NR
item2          200648
item2          200649
item2          200650
item2          200651
item2          200652
item2          200701
item2          200702
item2          200703
item2          200704
item2          200705
item2          200706
ITEM          WEEK_NR
item2          200707
item2          200708
item2          200709
item2          200710
item2          200711
item2          200712
61 rows selected.
SQL> truncate table table1;
Table truncated.
SQL> begin
  2  sample_proc('item2', '200650', '200702');
  3  end;
  4  /
PL/SQL procedure successfully completed.
SQL> select count(*) from table1;
  COUNT(*)
         5
SQL> select * from table1;
ITEM          WEEK_NR
item2          200650
item2          200651
item2          200652
item2          200701
item2          200702Regards,
Mohana
Message was edited by:
Mohana Kumari