Join of Multiple Tables

Question

We are experiencing an unpredictable error in a simple form and have
experimented it in different scenarios it behaves in the same way.
The problem description is as under:
We are using "Join of Multiple Tables" feature of Developer-6i. In our
forms there are two tables e.g. Emp and Dept. We have set all the
properties requiered to do this job inluding:
1. "Query Data Source Name" is set to Emp,Dept.
2. "Where Cluase" is set to Emp.Deptno = Dept.Deptno
3. "DML Target Name" is set to EMP.
4. Manullay created the columns for Dept.Dname.
5. Set the Query-Only Property to Yes.
6. Set the Primary Key Property to Yes for Empno
When we execute this form it performs properly with the normal operations.
It inserts, updates and delete records properly But in the scenario e.g.
when we scroll to 5th or any other record greater this number and
start changing employee name and committing on the each record going
backward. It generates Primary Key Violation errors after updating
4-5 records.
When we locate the error in "Display Error" button it shows the update
statement as "UPDATE EMP SET WHERE ROWID=:1" and there is no "Field=Value"
cluase in the UPDATE statement.

Answer 1

Hi, Mahesh,
So you want only 1 row of output for each distinct combination of currentpress and lastpcirim?  That sounds like a job for GROUP BY.
And you want that row to contain a delimited list of all the different typidcontainers?  That sounds like a job for the aggregate LISTAGG function.
WITH  joined_data  AS
    SELECT DISTINCT
                mst.curepress, mst.lastpcirim, inf.typeidcontainer
    FROM        betmaster mst
    LEFT JOIN   betinfo   inf   ON  TRIM (mst.curepress) = SUBSTR ( TRIM (inf.currentpress)
                                                                  , 1
                                                                  , 3
SELECT    curepress, lastpcirim
,         LISTAGG (typeidcontainer, ', ')
              WITHIN GROUP (ORDER BY  typeidcontainer)   AS container_list
FROM      joined_data
GROUP BY  curepress, lastpcirim
Unfortunately, you can't say LISTAGG (DISTINCT ...), so you still have to get the distinct containers the way you're already doing it.  (Notice that the sub-query is just what you posted.)
Thanks for posting the CREATE TABLE and INSERT statements; that's very helpful.  Don't forget to say which version of Oracle you're using.  LISTAGG was new in Oracle 11.2.
Why not add CHECK constraints (and maybe triggers) to your tables, so that curepress and currentpress are not stored with leading or trailing spaces?  Then you wouldn't need to use TRIM in queries like this, and your code would be simpler and more efficient.