SUM(DISTINCT) Based on Other Columns

Question

I currently have a table that looks something like this:

+------+-------+------------+------------+
| id   | rate  | first_name | last_name  |
+------+-----         


        

Answer 1

select sum (rate)
from yourTable
group by first_name, last_name

Edit

If you want to get all sum of those little "sums", you will get a sum of all table..

Select sum(rate) from YourTable

but, if for some reason are differents (if you use a where, for example) and you need a sum for that select above, just do.

select sum(SumGrouped) from 
(    select sum (rate) as 'SumGrouped'
    from yourTable
    group by first_name, last_name) T1