title: MySQL - "view" for a specific cell
body: <p>I have a MySQL table with some columns and rows. Lets call it A.
  I would like to create something like a "view" for a specific cell inside this table.
  I mean, I would like, for example, the value of the cell to be any value selected from table B and divided by some value taken from table C.
  And I want this cell always be up to date.</p>
  
  <p>Is it possible in MySQL? If yes, how?</p>