In the example above, if any of the "UnitsOnOrder" values are NULL, the result will be NULL. Solutions MySQL The MySQLIFNULL()function lets you return an alternative value if an expression is NULL: SELECTProductName, UnitPrice * (UnitsInStock + IFNULL(UnitsOnOrder,0)) ...
1) Understanding of Basic Commands Knowledge of basic commands builds the foundation for lifelong learning. Otherwise, you will just be memorizing the facts without understanding how they fit together. Some of the most commonly used SQL commands are as follows: SELECT & FROM:to retrieve the attrib...