ABAP Keyword Documentation → ABAP Glossary
Native SQL
Statements that can be listed in the 
ABAP programs between the statements 
EXEC SQL and ENDEXEC. Database-specific
SQL statements and special SAP-specific statements are possible  Native SQL statements are not fully checked by the
syntax check and are handled by the
Native SQL interface of the
database interface. Refer to
ADBC for more information.