If you are unlucky enough to have the surname "Null", you basically don't exist, as far as some SQL servers are concerned iStock It is a troublesome process registering for an account with online ...

One of the trickiest aspects of relational database management can be dealing with missing information. The standard method of representing missing information is to set the “value” to null. A null ...

IS NULL and IS MISSING are predicates that test for a missing value. IS NULL and IS MISSING are used in the WHERE, ON, and HAVING expressions. Each predicate resolves to true if the sql-expression's ...