Oracle Problemetic query

Question

Hi All,
I encountered a strange problem in oracle PL/SQL.
I have a select query which fetches records from more than one table and it returns n rows lets say 1000 rows.
Note: The tables used in select query have a constant data.At any time i query, it returns the same result.
But when the same select query is used in an insert statement, it inserts less number records, say 300 records instead of 1000 rows.
Note: The destination table does not have any constraints (primary key/not null constraints).
Example
The select query :
SELECT
A.COL1,
A.COL2,
B.COL3,
B.COL2
FROM
TAB1 A
JOIN
TAB2 B
ON (A.COL4 = B.COL4);
The above query returns 1000 rows.
The insert query
INSERT INTO
TAB3
C1,
C2,
C3,
C4
SELECT
A.COL1,
A.COL2,
B.COL3,
B.COL2
FROM
TAB1 A
JOIN
TAB2 B
ON (A.COL4 = B.COL4);
The above insert statement inserts only less rows i.e., 300 instead of 1000.
Can any one help me out to sort this issue.
Thanks in advance.

Answer 1

Sorry, I can't replicate the problem. I'm on 10.2.0.4, Windows XP.
SQL> select o.object_id
  2        ,o.created
  3        ,s.synonym_name
  4        ,s.table_name
  5  from   all_objects  o
  6  join   all_synonyms s
  7  on     o.object_name = s.synonym_name
  8  and    o.owner       = s.owner
  9  ;
20080 rows selected.
SQL> insert into tab3
  2  (object_id
  3  ,created
  4  ,synonym_name
  5  ,table_name
  6  )
  7  select o.object_id
  8        ,o.created
  9        ,s.synonym_name
10        ,s.table_name
11  from   all_objects  o
12  join   all_synonyms s
13  on     o.object_name = s.synonym_name
14  and    o.owner       = s.owner
15  ;
20080 rows created.
SQL> select count(*) from tab3;
            COUNT(*)
               20080
SQL> truncate table tab3;
Table truncated.
SQL> create or replace
  2  procedure insert_rows as
  3  begin
  4     insert into tab3
  5     (object_id
  6     ,created
  7     ,synonym_name
  8     ,table_name
  9     )
10     select o.object_id
11           ,o.created
12           ,s.synonym_name
13           ,s.table_name
14     from   all_objects  o
15     join   all_synonyms s
16     on     o.object_name = s.synonym_name
17     and    o.owner       = s.owner
18     ;
19     commit;
20  end;
21  /
Procedure created.
SQL> exec insert_rows
PL/SQL procedure successfully completed.
SQL> select count(*) from tab3;
            COUNT(*)
               20080