[awk command] SQL aggregate function 'sum' equivalent in bash shell script (sum column based on multiple fields)

awk '{array[$1]+=$3} END { for (i in array) {print i"," array[i]}}' datas.csv

This function aggregates the rows with similar [$1","$2] combinations 

and output the sum

e.g    Say-Tar   DNA-FISH  35

       Say-Tar   C2C12     24

       Say-Tar   C2C12     3

       Georgi    Gro-seq   5

       Georgi    ChIP-seq  7

       Brian     iPSC      24

Then the output should be 

Say-Tar,   DNA-FISH,  35

Say-Tar,   C2C12,     27

Georgi,    Gro-seq,   5

Georgi,    ChIP-seq,  7

Brian,     iPSC,      24