Show measure based on other column

Question

I am trying to write oracle sql for below scenario. Can anyone provide pointers?

My data is like

Now whenever a customer has 401k account I have to default the balance to zero else show the total balance.

Thanks, Pratap

Answer 1

You can do this with a case expression.

select customer,
case when count(case when account='401K' then 1 end) > 0 then 0 else sum(balance) end 
from tbl
group by customer