如何更正这种情况表达

Question

I have the following code:

select c from(
select 
CASE WHEN EXISTS  (select number, lmn 
  from inma
  WHERE (number='6447' and lmn='ZKZ'))
  then 'yes'
    else 'no' end as c
      from inma )
group by c

I have many number and lmn records in the database, that is why I would like when I run the code to see number and lmn and the result 'yes' (if the number and lmn exist) and 'no' (if they do not exist). You can see what I would like to see in the screen shot below.

How I can do this? I use PL/SQL developer

Thanks for your cooperation in advance.

Answer 1

If you want to see those extra fields, then it seems to me that you can just do this:

SELECT
  i.number,
  i.lmn,
  CASE WHEN i.number='6447' AND i.lmn='ZKZ' THEN
    'yes'
  ELSE 
    'no'
  END AS c
FROM
  inma i

If number and lmn contain duplicates, and you want to hide that, you can use SELECT DISTINCT . You only need to group by when you are aggregating (eg calculating a sum).