Restrictions or limitations on tables and attributes. For example, a wine can be produced only by one winery, an order for wine can’t exist if it isn’t associated with a customer, having a name attribute could be mandatory for a customer.
MySQL Interview Questions and Answers
Restrictions or limitations on tables and attributes. For example, a wine can be produced only by one winery, an order for wine can’t exist if it isn’t associated with a customer, having a name attribute could be mandatory for a customer.