title: How to store a count of the number of visits to a client premises?
body: <p>I am working on a project in MySQL and PHP. I want to create a database for clients and one of the columns should be how many times the client has visited the company because each time he/she gets a new reward.</p>
  
  <p>What I was thinking about is make that column (for number of visits) to be a checkbox that the employee cannot choose the second number till the first one exists.</p>
  
  <p>I mean the employee cannot choose 2 till 1 is chosen.</p>
  
  <p>However, I don't have an idea how this can be created in MySQL. So, can anybody tell me please? Or if you have any other thoughts to do this job.</p>