Awk - Count Each Unique Value and Match Values Between 2 Files - shell

Question

I have two files. I am trying to get the count of each unique field in column 8 in file 1, and then match the unique field value from the 6th column of the 2nd file.
So essentially, I am trying to -> take each unique value and value count from column 8 from File1, if there is a match in column6 of file2
File1:
2020-12-23 23:59:12,235911688,\N,34,20201223233739,797495497,404,819,\N,
2020-12-23 23:59:12,235911419,\N,34,265105814,718185263,200,819,\N,
2020-12-23 23:59:12,235912029,\N,34,20201223233739,748362773,404,819,\N,
2020-12-23 23:59:12,235911839,\N,34,20201223233738,745662697,404,400,\N,
2020-12-23 23:59:12,235911839,\N,34,20201223233738,745662697,404,400,\N,
2020-12-24 23:59:12,235911839,\N,34,20201223233738,745662697,404,400,\N,
File2:
public static String status_code = "819";
public static String DeActivate = "400";
Expected output:
total count of status_code,819 : 3
total count of DeActivate,400 : 3
My code:
awk 'NR==FNR{a[$8]++}NR!=FNR{gsub(/"/,"",$6);b[$6]=$0}END{for( i in b){printf "Total count of %s,%d : %d\n",gensub(/^([^ ]+).*/,"\\1","1",b[i]),i,a[i]}}' File1 File2
Algorithm
1.Take the 8th feild from 1st file:(eg:819)
2.Count how time unique feild(819) occurs in file(based of date)
3 take the corresponding value of 819 from 4th feild of file2
4 print output together
I believe I should be able to do this with awk, but for some reason I am really struggling with this.

Answer 1

(It is something like SQL JOINing two relational database tables on File1's $8 being equal to File2's $6.)
awk '
NR==FNR { # For the first file
a[$8]++; # count each $8
}
NF&&NR!=FNR { # For non empty lines of file 2
gsub(/[^0-9]/,"",$6); # remove non-digits from $6
b[$6]=$4 # save name of constant to b
}
END{
for(i in b){ # for constants occurring in File2
if(a[i]) { # if File1 had non zero count
printf( "Total count of %s,%d : %d\n",b[i],i,a[i]);
#print data
}
}
}' "FS=," File1 FS=" " File2
The above code works with your sample input. It produces the following output:
Total count of DeActivate,400 : 3
Total count of status_code,819 : 3
I think the main problem is that you do not specify comma as field separator for File1. See Processing two files with different field separators in awk

Answer 2

A shorter, more efficient, way without the second array and for loop:
$ cat demo.awk
NR == FNR {
a[$8]++
next
}
{
gsub(/[^0-9]/,"",$6)
printf "Total count of %s,%d : %d\n", $4, $6, a[$6]
}
$ awk -f demo.awk FS="," file1 FS=" " file2
Total count of status_code,819 : 3
Total count of DeActivate,400 : 3
$