How to count word in pdf file

Question

I have an Question.

 

i just Want to read pdf data. then i match the maximum similar word in pdf with some Word.

Like Sql word are common in Sql tutorial pdf file.so i just want to count the sql word in pdf.

then i want to  share the pdf according to maximum word to  sql Teacher.so how is it possible. if Anyone have Idea about this so plz share with me asap.