title: Check if mysql field contains a certain number in mysql query
body: <p>I am having a table with a column that has few ids that were put into database with multi select. Column for example contains: 1,4,5,7,9. Is it possible to check if this column contains for example number 5 or not in it through MySQL query ?. 
  I need to select all the people that have number 5 or some other listed in that field and print them through php.</p>