Using Union in popup LOV

Question

HI,
I want to select data from 2 tables using Union in Popup LOV ,
please help.
I am getting a error message like
"LOV query is invalid, a display and a return value are needed, the column names need to be different. If your query contains an in-line query, the first FROM clause in the SQL statement must not belong to the in-line query."
when i use union query
my query is like this
select a from table 1
union
select b from table 2
order by a;

Answer 1

Hi,
Three things -
1) Remove the semi-colon from the end of your query (it can work without it, but you'll eventually run into problems some day by putting a semi-colon on the end, so better to get into the habit of not doing it).
2) You need to provide 2 columns in your query, a display value and a return value (look at the error message you are getting). You are only returning a single column.
3) Wrap your query inside another query to get it to work.
Something like this should work -
select * from (
  select 1 as r, 2 as d from dual
  union
  select 3 as r, 4 as d from dual)
order by dObviously change the values/columns to suit your own purposes.
Hope this helps,
John.