Look at the following SELECT statement: SELECTProductName, UnitPrice * (UnitsInStock + UnitsOnOrder) FROMProducts; 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...
As a simple example, indentation guidelines in the data selection language SQL are not that well-established. Such statement holds for other data selection languages such as XQuery, etc. as well. Furthermore, there are programming languages such as Smalltalk (Goldberg and Robson 1983) where ...