How to create a new column based on data out from a query

Question

I have a quick question.

ATtaching the SS for reference.

How can i set a new column 'Status' as NO based the nvl condition if the id is null then i have to map to the corresponding of another table.

Answer 1

You can do that using case statement.

select
    nvl(b.id,a.id) as id
    ,b.name
    ,case when nvl(b.id,a.id) is null then 'No' else 'Yes' End as Status
from dd b,
(select id, name from demo group by id, name)a
where a.id=b.id(+)