20 functions and 3 variants
Transform - 3 functions
Edit - 8 functions and 3 variants
Calculate - 5 functions
Compare - 2 functions
Find/Determine - 2 functions
function can't (yet) return <null> in FireBird 2.0
Interbase 2007 - since InterBase 2007 this function is substitutable with a native SQL statement.
Firebird 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