Using 2nd table in execute_query

Question

I have a form screen based on a table say Table A. This screen is populated from a value selected on the previous screen. I take the value in the previous screen and create a onetime where clause and use the execute_query on table A to populate the screen. But what i need is if the value provided is not found in Table A then i have to look up an other table say table B and populate the screen based on Table B. Now how can i do it since the screen is based on Table A and if that value is not found i have to get values from the second table.
Thanks

Answer 1

Ans: At this point the table B is not defined in the form. There is only a data block based on table A. So i pass the ontime_where clause to this block and run the execute query to populate the block.
Ans: yes i would be querying for the same value searched in table A.This being the case, I suggest you consider the Stacked Canvas (SC) option I mentioned in my original post. This would require you create a Base Table Block for each table and a corresponding SC object for each block. The SC's will be displayed inside a Content Canvas. In your existing code, set the ONETIME_WHER E for both blocks. Execute the query for BLOCK_A first. If the query returns results - stop. If no results, then go to BLOCK_B and execute the query. For example:
BEGIN
   Go_Block('BLOCK_A');
   Execute_Query;
   IF ( To_Number(Get_Block_Property('BLOCK_A',QUERY_HITS)) = 0 ) THEN
      -- Block_A returned no records.  Go to block B
      Go_Block('BLOCK_B');
      Execute_Query;
   END IF;
END;You shouldn't have to hide the BLOCK_A view as navigation to BLOCK_B should automatically hide Block_A.
Hope this helps,
Craig B-)
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