Data engine functions in HSQLDB and Firebird
First column shows functions of HSQLDB, which aren't available in Firebird. Second column will show functions, which will work in HSQLDB and Firebird with the same result. Third column show functions of Firebird, which must be chosen instead of functions in HSQLDB. This functions give the same result as the functions in the same row for HSQLDB, but aren't available with this name of the function in HSQLDB.