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