sql - HOw to merge two rows into one adding last column if the row's first and second columns are equal -

i have 2 rows this:

a   b  val 2   3  43 2   3  32

i want output

a  b  val 2  3  75=(43+32)

i want tis operation applied whole table.

how can using sql query - in sqlite?

it looks need group by

select  a, b, sum(val)    yourtable group         a, b

Three