title: How to create MySQL Table with no Insert allowed
body: <p>In MySQL i need a table that stores only one static value, which the application can access and change if needed. For this purpose i have to make sure there can't be another row inserted. </p>
  
  <p>So i need to create a table that allows update operations, but no insert and no delete operations. 
  Is there another way than checking the size of the table in a trigger and if > 1 cancel the operation?</p>