id,name,chief,age,skill
2,john,1,30,C
7,alia,1,28,C
4,eve,0,25,C++
4,eve,0,25,C
5,duncan,4,30,Perl
1,carl,0,20,C++
7,alia,1,28,PHP
7,alia,1,28,Python
3,dean,1,33,C++
1,carl,0,20,Python
2,john,1,30,PHP
0,jack,0,22,Python
0,jack,0,22,C
1,carl,0,20,System Admin
4,eve,0,25,Perl
5,duncan,4,30,C