Mapping over more than 1 schema

Question

Hi,
I have to do the following mapping:
Workspace user: user_ws
Transfer data from user send_user.table1 to get_user.table2
Whe I create 2 locations (localtion_send_user and location_get_user the 2 owners of the 2 tables) I can see the 2 tables (1 in each schema/location)
How can I create a mapping as user_ws using both tables and locations?
Please help me
Siegwin

Answer 1

You may have NULL values in those columns:
test@ORA10G>
test@ORA10G> --
test@ORA10G> with t as (
  2    select 100 id, 1 a,  10 b  from dual union all
  3    select 100,    2,    20    from dual union all
  4    select 100,    3,    null  from dual union all
  5    select 100,    null, 40    from dual union all
  6    select 100,    null, null  from dual)
  7  --
  8  SELECT SUM(a + b) AS c
  9    FROM t
10   GROUP BY ID;
         C
        33
1 row selected.
test@ORA10G>You probably want to see 76 here. So -
test@ORA10G>
test@ORA10G> --
test@ORA10G> with t as (
  2    select 100 id, 1 a,  10 b  from dual union all
  3    select 100,    2,    20    from dual union all
  4    select 100,    3,    null  from dual union all
  5    select 100,    null, 40    from dual union all
  6    select 100,    null, null  from dual)
  7  --
  8  SELECT SUM(NVL(a,0) + NVL(b,0)) AS c
  9    FROM t
10   GROUP BY ID;
         C
        76
1 row selected.
test@ORA10G>
test@ORA10G>If you simply get a NULL, I'll bet you have NULLs for all records in both those columns.
test@ORA10G>
test@ORA10G> --
test@ORA10G> with t as (
  2    select 100 id, null a,  null b  from dual union all
  3    select 100,    null,    null    from dual union all
  4    select 100,    null,    null  from dual union all
  5    select 100,    null, null    from dual union all
  6    select 100,    null, null  from dual)
  7  --
  8  SELECT SUM(a + b) AS c
  9    FROM t
10   GROUP BY ID;
         C
1 row selected.
test@ORA10G>Use NVL. Make life easy.
isotope