Question

select id, name, 'First Category' as category, count(id) as totalCalls
from missed_call
where name = 'whatever1'
group by name, category
UNION
select id, name, 'Second Category' as category, count(id) as totalCalls
from missed_call
where name = 'whatever2'
group by name, category
order by name ASC, totalCalls DESC

The previous query will not retrieve the records where totalCalls is 0.

So, how can I do to get those records and present totalCalls as 0?

UPDATE: I have tried changing count(id) as totalCalls for IFNULL(count(id), 0) as totalCalls but it doesn’t solve the problem. Perhaps, because count(id) is actually not null, it just does not exist.

Answer 1

If you are unwilling to expand your database schema you can always pretend there is a table:

select surrogateTable.name, 
       surrogateTable.Category, 
       count(id) as totalCalls
from 
(
  select 'whatever1' Name,
         'First Category' Category
  union all
  select 'whatever2',
         'Second Category'
) surrogateTable
left join missed_call
  on surrogateTable.Name = missed_call.Name
group by surrogateTable.name, surrogateTable.category

I dropped id in select because you should not select something you are not grouping on – this is probably MySql.

Check this on Sql Fiddle.