http://akiniwa.hatenablog.jp/entry/2014/04/08/220430
vim a.txt
20200601 AAA 10
20200602 AAA 20
20200603 AAA 30
20200604 BBB 100
20200605 BBB 120
20200606 CCC 10
20200607 CCC 12
20200608 CCC 12
20200609 DDD 300
{
sum[$2]+=$3
count[$2]+=1
if ( min[$2]=="" || $3 < min[$2]) { min[$2]=$3 }
if ( $3 > max[$2] ) { max[$2]=$3 }
};
END {
for (key in sum) {
print key, sum[key], count[key], sum[key]/count[key], min[key], max[key]
}
}
