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SAP ABAP HR

There is nothing much difference between Abap and HR Abap. The way we retrieve the data from data base is different. In general ABAP data is stored in Tables, but coming to HR ABAP employee data is sorted through Infotypes. The way we retrieve the data from infotypes is different in HR Abap.
In general ABAP we use Logical data base very rare, as in HR ABAP most of the programs use Logical data base to select data from Infotypes by using Get event. In ABAP we use read statement to read particular record, still in HR ABAP we do use read statement apart from that we have Macros and provide statement.
Macro is pre defined code (like function module) which reads data from internal table (internal infotype) based on dates. Provide statement is like Select statemen  Show less