ABAP Native SQL enables you to enter database-particular SQL statements in an ABAP application. Maximum ABAP applications comprising database-specific SQL statements do not operate with various databases. If heterogeneous databases are linked, practice Open SQL. To execute ABAP Native SQL in an ABAP utilization, employ the statement EXEC. Open SQL (Subset of standard SQL statements), allows you to get whole database tables accessible in the R/3 System, despite the business. To evade disputes among database tables and to keep ABAP applications autonomous from the database scheme practiced, SAP has created its individual collection of SQL statements known as Open SQL.
