[awk]Remove the duplicated lines and make a sum

Object

1. remove the duplicated lines.
   
2. make a sum for each person.

Input Data (delimiters : tab)

name   job   subject   records

min     student math    100

min     student english 100

min     worker  math    100

min     worker  english 100

yong    student math    50

yong    student english 70

yong    worker  math    20

yong    worker  english 30

When we might face with problem above.

if I have to make a sum for each person, I can use awk command.

Expected Result

yong    120

min     300

make a awk file.

BEGIN {

        FS = "\t"; # input data delimiter

        OFS= "\t"; # out data delimiter

        OUTPUT_FILE="result.txt";

}

{

        #x = current count of each variable.

        x[$1]++;

        if( x[$1] == 1 ){

                name[$1] = $1;

        }

        else {

# To make a sum

                record[$1] += $4;

        }

}

END {

# To scan all elements in the array.

# n refers to Index in x. such as min, yong.

        for( n in x ){

                print name[n],record[n] > OUTPUT_FILE;

        }

}

Actually, I use the way instead of 'sort' and 'uniq' commands.

I wonder how to make the same result using both of them.

tip. How to use a variable when you use the command.

you can use the variables in the awk files.

$>awk -v var=something -f makeAsum.awk test.txt