title: set maximum value to a column
body: <p>I have a table with a column (int type) called age. This column should hold maximun value 50. If it exceeds then it shouldn't update that row.</p>
  
  <p>Means this column shold take values from 0 to 50.</p>
  
  <p>If I try to update that to 51 then that shouldn't allow.</p>
  
  <p>Could any one help....!</p>