MySQL insert row on duplicate key update multiple columns

Question

I have a table (name, date, stat1, stat2, stat3), (name, date) is the PK. When I insert rows, there will be duplicate keys, and I need to sum up th

Answer 1

Add a computed column (sum) and include that in your PK.

However, this does denormalize your table. You could use a surrogate key and do the calculation in your SELECT