10 Functions
Diverse Functions - 4 functions
NVL Functions - 6 functions
Interbase 2007 - since InterBase 2007 this function is substitutable with a native SQL statement.
Firebird 2.0 - since FireBird 2.0 this function is substitutable with a native SQL statement
Frebird 2.1 - since FireBird 2.1 this function is substitutable with a native SQL statement
Output RETURN mechanism if nothing other is published: FREE_IT
TestSQLs with NULL run only in FireBird 2.0