load_extension('perlvtab.so')
student|Arithmetic|Reading|Writing
Fred|B|A|B
Mary|||B
student|Arithmetic|Reading|Writing
Fred|B|A|B
Reading
A
Arithmetic
B
student
Fred
student
Mary
load_extension('perlvtab.so')
student|Arithmetic|Reading|Writing
Fred|B|A|B
Mary|||B
student|Arithmetic|Reading|Writing
Fred|B|A|B
Reading
A
Arithmetic
B
student
Fred
student
Mary