Creating a where clause in the LOV query box

Question

Hi guys is any able to help me with this one
i have a page in my app where there is a LOV drop down now the values for this drop down comes from a table that looks like this
users_for _form_TBL
E_MAIL
Vendor
[email protected]
oracle
[email protected]
sap
[email protected]
IBM
[email protected]
Oracle
[email protected]
intergraph
So my syntax for the LOV i mentioned looks like this
select VENDOR as display_value, VENDOR as return_value
  from form_user_tab where E_MAIL = :APP_USER
order by 1 ;
so if [email protected] logs onto the app and has to make a selection on the LOV it would only display the vendors relative to his E_MAIL like oracle ,sap, IBM then he hits the submit button on the page then the vendor that he selected is inserted into another table .What i did on the insert table was create a trigger that after a vendor is inserted the trigger inserts a 1 into a column called assessed .
What i did after this was add a select in the where clause of the LOV so that it would check in the insert table if that vendor had been chosen before and not display it again to be selected  my syntax the second time around in the SQL query box was
select VENDOR as display_value, VENDOR as return_value
  from users_for _form_TBL where E_MAIL = :APP_USER
and (select 'vendor' , 'ASSESSD' from inserted _tbl_imp is null);
order by 1 ;
But im getting an error any ideas guys .Thank you

Answer 1

Hay man thanks for that info on the Tom Kyte Blog 
--(the code you gave me )
select 
    u.vendor display_value 
  , u.vendor return_value
from 
    users_for_form_tbl u 
where 
    u.e_mail = :app_user 
and not exists (select null from inserted_tbl_imp i where u.vendor = i.vendor) 
order by 
    u.vendor 
--(After the error i tried )Then when i got the error i try'd using 'or exists'  like this
--(code)
where 
    u.e_mail = :app_user 
and not exists (select null from inserted_tbl_imp i where u.vendor = i.vendor) 
                      or exists (select null from inserted_tbl_imp i where u.vendor = i.vendor)
order by 
    u.vendor 
But the all the vendors that where in the  same in the insert table came up in the drop down list  example is oracle was assessed before then only oracle would appear in the drop down list  and if it was assessed 3 times it would come up 3 times
--Then i tried to select where 'Assessed' is null   ('Assessed' is a column in the insert table  which i created a trigger on to insert 1 in the 'ASSESSED' column  when a vendor is begin assessed  )  
--(code)
where 
    u.e_mail = :app_user 
and not exists (select 'ASSESSED' from inserted_tbl_imp i where 'ASSESSED' is null ) 
order by 
    u.vendor 
This try didnt return any vendors at all
--Then i tried distinct
--(code)
where 
    u.e_mail = :app_user 
and not exists (select distinct 'VENDOR',  from inserted_tbl_imp i where u.vendor = i.vendor) 
order by 
    u.vendor 
This gave me a LOV ERROR
This is what i have tried so far there where others syntax's i tried last night as well  but most of them came back as errors . Thanks again for you time and help  fac586