Load from Source-Destination=?Table structure not the same.

Question

Hi
I have to copy data from source table to destination table. The structure of the 2 are not the same. Number of records in destination table should be half number of records in source. The reason being in the source a column named (e.g.) c_type = 'Up' - one row or 'Down' - in another row. The same is reprsented in the destination as 1 row since the number of columns is more. Example up_name, down_name, up_dep, down_dep.
How can I insert into the destination depending on the c_type column in the source?
Example:
I want to insert into destination.up_name where c_type = 'Up' and destination.down_name where c_type = 'Down'...
and so onHow can I write my sql query such that I have to write one insert statement and put the right data in the right column?

Answer 1

Mass25 wrote:
Number of records in destination table should be half number of records in source. The reason being in the source a >column named (e.g.) c_type = 'Up' - one row or 'Down' - in another row. The same is reprsented in the destination >as 1 row since the number of columns is more. Example up_name, down_name, up_dep, down_dep. Hope this is what you are looking for:
SQL> WITH SOURCE AS
  2       (SELECT 1 id_col, 'UP' c_type, 'up_name_1' name_col,
  3               'up_dept_1' dept_name
  4          FROM DUAL
  5        UNION ALL
  6        SELECT 1 id_col, 'DOWN' c_type, 'down_name_1' name_col,
  7               'down_dept_1' dept_name
  8          FROM DUAL
  9        UNION ALL
10        SELECT 2 id_col, 'UP' c_type, 'up_name_2' name_col,
11               'up_dept_2' dept_name
12          FROM DUAL
13        UNION ALL
14        SELECT 2 id_col, 'DOWN' c_type, 'down_name_2' name_col,
15               'down_dept_2' dept_name
16          FROM DUAL
17        UNION ALL
18        SELECT 3 id_col, 'UP' c_type, 'up_name_3' name_col,
19               'up_dept_3' dept_name
20          FROM DUAL
21        UNION ALL
22        SELECT 3 id_col, 'DOWN' c_type, 'down_name_3' name_col,
23               'down_dept_3' dept_name
24          FROM DUAL)
25  SELECT * FROM SOURCE
26  /
    ID_COL C_TY NAME_COL    DEPT_NAME
         1 UP   up_name_1   up_dept_1
         1 DOWN down_name_1 down_dept_1
         2 UP   up_name_2   up_dept_2
         2 DOWN down_name_2 down_dept_2
         3 UP   up_name_3   up_dept_3
         3 DOWN down_name_3 down_dept_3
6 rows selected.
SQL> WITH SOURCE AS
  2       (SELECT 1 id_col, 'UP' c_type, 'up_name_1' name_col,
  3               'up_dept_1' dept_name
  4          FROM DUAL
  5        UNION ALL
  6        SELECT 1 id_col, 'DOWN' c_type, 'down_name_1' name_col,
  7               'down_dept_1' dept_name
  8          FROM DUAL
  9        UNION ALL
10        SELECT 2 id_col, 'UP' c_type, 'up_name_2' name_col,
11               'up_dept_2' dept_name
12          FROM DUAL
13        UNION ALL
14        SELECT 2 id_col, 'DOWN' c_type, 'down_name_2' name_col,
15               'down_dept_2' dept_name
16          FROM DUAL
17        UNION ALL
18        SELECT 3 id_col, 'UP' c_type, 'up_name_3' name_col,
19               'up_dept_3' dept_name
20          FROM DUAL
21        UNION ALL
22        SELECT 3 id_col, 'DOWN' c_type, 'down_name_3' name_col,
23               'down_dept_3' dept_name
24          FROM DUAL)
25  SELECT s1.id_col, s1.name_col up_name, s1.dept_name up_dept,
26         s2.name_col down_name, s2.dept_name down_dept
27    FROM SOURCE s1 JOIN SOURCE s2
28         ON (s1.id_col = s2.id_col AND s1.c_type = 'UP' AND s2.c_type = 'DOWN
29  /
    ID_COL UP_NAME     UP_DEPT     DOWN_NAME   DOWN_DEPT
         1 up_name_1   up_dept_1   down_name_1 down_dept_1
         2 up_name_2   up_dept_2   down_name_2 down_dept_2
         3 up_name_3   up_dept_3   down_name_3 down_dept_3
3 rows selected.
SQL>Source had 6 records and it was self joined to give 3 records which can be populated in Destination Table.
Always post some sample data with desired result. That will get you quick responses.
Regards,
Jo
Edited: Added Quote Tags