Finding duplicates across range and summing it up

Question

I have a list of agents who are working on OT, but the challenge is that they have 2 entries for OT per day, and when i need to work on this data with another sheet i have to sort out the data and remove duplicates manually in order not to cause issues with vlookup.

I need the end result to be like this:

if any agents works OT 2 times a day then sum it up and place in one raw with the date.

i have made helpers columns to show the duplicates but the i got stuck with the next steps

here is the sheet for the example:

https://docs.google.com/spreadsheets/d/1rdqylI9Rr4CxPIJcffEsqfoHx0loPVrqi2UJAQ30Sos/edit#gid=0

Answer 1

use:

=QUERY(A2:C, "select A,B,sum(C) where C is not null group by A,B label sum(C)''")

and vlookup from it...