classic-super comparison table. Moved a number of sections on installing, working with databases, and (un)safety into newly created top-level sections. 2.2.1 22 Dec 2005 PV Corrected statement on SS thread usage section. Added a subsec- tion on DISTINCT. Changed “More about NULLs” subsection some- what. Renamed “Safety measures” to “Preventing data loss”. The Security subsection has been moved elsewhere. Extended Backup

FLOAT data type has an approximate precision of 7 digits after the decimal point. To ensure the safety of storage, rely on 6 digits. 3.2.2. DOUBLE PRECISION The DOUBLE PRECISION data type is stored indicating that the value of the element either is unknown or it does not exist. It is not a zero, nor a void, nor an “empty string”, and it does not act like any value. When you use NULL in numeric, string they were set. • Due to its UDF-like nature, RDB$SET_CONTEXT can — in PSQL only — be called like a void function, without assigning the result, as in the second example above. Regular internal functions

approximate precision of 7 decimal digits after the decimal point (24 binary digits). To ensure the safety of storage, rely on 6 decimal digits of precision. The syntax FLOAT(bin_prec) was introduced in indicating that the value of the element either is unknown or it does not exist. It is not a zero, nor a void, nor an “empty string”, and it does not act like any value. When you use NULL in numeric, string they were set. • Due to its UDF-like nature, RDB$SET_CONTEXT can — in PSQL only — be called like a void function, without assigning the result, as in the second example above. Regular internal functions

was: typedef void (* isc_callback) (); Known Compatibility Issues 10 ISC_STATUS isc_que_events( ISC_STATUS *, isc_db_handle *, ISC_LONG *, short, char *, isc_callback, void *); In the Firebird 2.0 API it is: typedef void (*ISC_EVENT_CALLBACK) (void*, ISC_USHORT, const ISC_UCHAR*); ISC_STATUS isc_que_events( ISC_STATUS*, isc_db_handle*, ISC_LONG*, short, const ISC_EVENT_CALLBACK, void*); It may cause a compile-time incompatibility, as older event handling programs cannot be compiled if they use a bit different signature for a callback routine (e.g., void* instead

gesetzt wurden. • Aufgrund seiner UDF-ähnlichen Natur kann RDB$SET_CONTEXT — nur in PSQL — wie eine void-Funktion aufgerufen werden, ohne das Ergebnis zuzuweisen, wie im zweiten Beispiel oben. Reguläre