Select count of sum

Question

Hi
Need help with getting a count of different sums:
Table: Stay
Columns: Name, Nights
each name can have multiple rows with different number of nights, now I have a select looking like this:
select sum(nights),name from stay
group by name
The result could look something like this:
1 smith
2 miller
1 grant
1 simpson
2 sharp
How do I do to get a count on the sum(night)? Is it possible in the same query?

Answer 1

If you want to count how many distinct records appear in your current select statement (i.e. 5 in this case), you can do
SELECT count(*) num_distinct_guests,
       total_nights,
       name
FROM (
  SELECT sum(nights) total_nights,
         name
    FROM stay
  GROUP BY name
)If you want the total number of stays, in addition to the total time stayed, use something like
SELECT sum(nights),
       name,
       count(nights)
  FROM stay
  GROUP BY name;Justin