Query from multiple data blocks

Hello professionals,
I having difficulty in finding solutions to query data from multiple data blocks. By the way I'm using Oracle Forms 10g
I have 4 data blocks and all items are database items
Below are the blocks,
1. student_main (columns : student_id, student_name, student_state)
2. subject_main (columns : subject_id, subject_desc, subject_student_id)
3. invoice_main (columns : invoice_no, invoice_amt, invoice_student_id)
4. receipt_main (columns : receipt_no, receipt_amt, receipt_invoice_ref)
The form will need to allow user to be able to query from any of the items/fields from the data blocks as listed above
For eg,
: if user query student_id then all related value items from table subject_main, invoice_main, receipt_main need to be displayed
: if user query invoice_no then all related value items from table student_main, subject_main, receipt_main need to be displayed
However the tricky part is that some student might have or might not have invoice / receipt data
I tried using relations but it didn't work both ways
I even create relations in every table (student_main to subject_main, subject_main to student_main, invoice_main to student_main, student_main to invoice_main and etc.) but it just make my running process hang
Need help on this matter
Thank you
Edited by: 990092 on Feb 25, 2013 12:15 AM

990092 wrote:
Hello professionals,
I having difficulty in finding solutions to query data from multiple data blocks. By the way I'm using Oracle Forms 10g
I have 4 data blocks and all items are database items
Below are the blocks,
1. student_main (columns : student_id, student_name, student_state)
2. subject_main (columns : subject_id, subject_desc, subject_student_id)
3. invoice_main (columns : invoice_no, invoice_amt, invoice_student_id)
4. receipt_main (columns : receipt_no, receipt_amt, receipt_invoice_ref)
The form will need to allow user to be able to query from any of the items/fields from the data blocks as listed above
For eg,
: if user query student_id then all related value items from table subject_main, invoice_main, receipt_main need to be displayed
: if user query invoice_no then all related value items from table student_main, subject_main, receipt_main need to be displayed
However the tricky part is that some student might have or might not have invoice / receipt data
I tried using relations but it didn't work both ways
I even create relations in every table (student_main to subject_main, subject_main to student_main, invoice_main to student_main, student_main to invoice_main and etc.) but it just make my running process hang
In general, relation will work. your relation creating was wrong, i think.
do as
1. student_main master to subject_main details
2. student_main master to invoice_main details
3. invoice_main master to receipt_main details
Hope this helps
Hamid

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