Append Leading Zero's

Question

Hi ,
the follwing SQL generates Zero's prefixed to the rownum. While inserting the data into table all the zero's go away
why ?
How can i insert data with Zero's ?
<SQL>
select
(Case length(rownum)
when 1 then '0000'||rownum
when 2 then '000'||rownum
when 3 then '00'||rownum
when 4 then '0'||rownum
else
to_char(rownum)
END )
from
SELECT o.class_code d
FROM sun_oracle_schedule_backup@ougbs_ougbs.world o
Union
SELECT to_number(m.schedule_id,'99999') d
FROM sun_MYSQL_schedule_backup@ougbs_ougbs.world M
Union
SELECT o.class_code d
FROM sun_internal_schedule_backup@ougbs_ougbs.world o
<SQL>
Out put of the above query
00001
00002
00003
00004
00005
00006
00007
When used with INSERT statement the table has the values as
1
2
3
4
5
6
7
Where did the Zero's GO?????
the table column data type is Number......
Thanks
--- Raj

Answer 1

Is the ciolumn that you are inserting into ..declared as a number or is it a varchar2?
sql> create table t(
  2    id number
  3  );
Table created.
sql> insert into t values (0001);
1 row created.
sql> insert into t values(0002);
1 row created.
sql> commit;
Commit complete.
sql> select * from t;
        ID
         1
         2If you declare it as a varchar2...
sql> create table t(
  2    id varchar2(10));
Table created.
sql> insert into t values ('0001');
1 row created.
sql> insert into t values ('0002');
1 row created.
sql> commit;
Commit complete.
sql> select * from t;
ID
0001
0002But why do you want to store the values appended with leading zero's in your table..???