How to use From clause as a block datasources

Question

Hi,
I want to know how to use from clause as a block datasource.
Could anyone give me an example to do that? I couldn't find it
in the help file.
I sincerely ask someone help me.
Many thanks
Diana

Answer 1

Diana,
I presume you are getting a "FRM-40505: error unable to perform
query" when you try to execute query. I suggest you select the
"Display Error" item from the "Help" menu to see the query that
Oracle is generating. If the query that Oracle generates as a
result of your "Query data source name" is not formed correctly,
you will get the FRM-40505 error.
Copy and paste the query that is displayed into SQLPLUS and test
to see what happens when you try to execute the query from
SQLPLUS. That will give you a better idea of what the cause of
the problem is.
From your example, a query that works should look like "select
c_no from (select c_no from books)".
Keep in mind that for blocks based on FROM clause, the query that
produces the data is of the form :
SELECT <all columns in the block>
FROM <select statement entered in the "Query Data Source Name"
blockproperty>
The data source for the block is the select statement embedded in
the from clause.
Hope this helps.