Editing Database abstraction layer (section)

=== Physical level (lowest level) ===
The lowest level connects to the database and performs the actual operations required by the users. At this level the conceptual instruction has been translated into multiple instructions that the database understands. Executing the instructions in the correct order allows the DAL to perform the conceptual instruction.

Implementation of the physical layer may use database-specific APIs or use the underlying language standard database access technology and the database's version SQL.

Implementation of data types and operations are the most database-specific at this level.