Top 20 SAP ABAP Interview Questions and Answers

By - SevenMentor•11/13/2025

SAP ABAP (Advanced Business Application Programming) continues to be a core skill for SAP developers, especially in S/4HANA environments where modern ABAP syntax, CDS Views, AMDP, and RAP model are gaining prominence. Whether you are preparing for your first interview or aiming to switch roles, understanding core as well as advanced ABAP concepts is crucial.

This blog covers the Top 20 ABAP Interview Questions and Answers, frequently asked in real-world interviews.

1. What is SAP ABAP?

Answer:
ABAP (Advanced Business Application Programming) is SAP’s 4th generation high-level programming language used to develop business applications in the SAP environment. It is primarily used to develop custom reports, module pool programming, enhancements, Smartforms, interfaces, BAPIs, and workflows.

2. What is the difference between Transparent Table, Pooled Table, and Cluster Table?

Type	Description	Example
Transparent Table	One-to-one relation with underlying database table; used for transactional data.	BKPF, BSEG
Pooled Table	Many small tables stored in a pool; used for control data.	T001E
Cluster Table	Multiple tables stored in a single cluster; used for large volumes of data.	BSEG Cluster

Note: In S/4HANA, pooled and cluster tables are no longer supported. Only transparent tables remain.

3. Explain Internal Tables in ABAP.

Answer:
Internal tables are temporary data structures stored in memory, used to process large datasets retrieved from database tables.
Types:

• Standard Table – Linear search, no unique key.
• Sorted Table – Automatically sorted, binary search.
• Hashed Table – Key-based access using hashing, fastest lookup.

4. What is a Work Area?

Answer:
A Work Area is a single row structure used to store one record of an internal table at a time.
Example:

DATA wa_ekko TYPE ekko.

5. What is the Difference Between Table Buffering Types?

Buffer Type	Description
Single-record buffering	Caches individual rows.
Generic buffering	Caches records based on generic key.
Full buffering	Entire table loaded into application layer memory.

6. What are BAPIs and how are they different from Function Modules?

Answer:
BAPI (Business Application Programming Interface) is a standardized programming interface exposing business objects to external systems.
Every BAPI is a RFC-enabled function module, but:

• BAPIs follow strict naming standards.
• They are part of Business Object Repository.
• Used for integration, not just internal logic.

7. What is an ABAP Data Dictionary?

Answer:
The Data Dictionary stores metadata about data structures such as tables, views, data elements, domains, search helps, and lock objects. It ensures data consistency across the system.

8. What is SE38 and SE80?

Transaction	Purpose
SE38	For program creation and editing.
SE80	Object Navigator used for end-to-end development including programs, classes, and function modules.

9. Difference between Primary and Secondary Index.

Answer:

• Primary Index: Automatically created for the primary key of the table.
• Secondary Index: Created manually to improve read performance for frequently executed queries.

10. What is ALV (ABAP List Viewer)?

Answer:
ALV provides a standard layout for reports with features like sorting, filtering, and exporting to Excel.
Common Function Modules:

• REUSE_ALV_LIST_DISPLAY
• REUSE_ALV_GRID_DISPLAY
• OO ALV: CL_GUI_ALV_GRID

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11. What is a Smartform?

Answer:
Smartforms are SAP’s graphical tool to design and print forms such as invoices, delivery notes, and purchase orders. No coding is required to change layout.

12. What is a BDC (Batch Data Communication)?

Answer:
BDC is used for data migration by simulating user input through screens.
Types:

• Call Transaction
• Session Method

In S/4HANA, BAPI and Data Migration Cockpit are preferred over BDC.

13. What are Enhancements in ABAP?

Enhancements allow modifying standard SAP behavior without changing SAP code.
Types:

• User exits
• Customer exits
• BADI
• Implicit/Explicit Enhancements

14. What is CDS View?

Answer:
Core Data Services (CDS) is next-generation data modeling on HANA used to define semantic layers on database tables using SQL-like syntax.
CDS pushes calculations to DB layer, improving performance.

15. What is AMDP?

Answer:
ABAP Managed Database Procedures are stored procedures written in SQLScript and executed in HANA to push calculations to DB layer.

16. What is the New ABAP Syntax for SELECT statement?

Example:

SELECT matnr, mtart

FROM mara

INTO TABLE @DATA(lt_mara).

17. What is a Lock Object?

Answer:
Lock Objects ensure data consistency by restricting simultaneous updates using ENQUEUE and DEQUEUE function modules.

18. What is Performance Tuning in ABAP?

Performance optimization ensures faster execution and lower memory usage.
Key Techniques:

• Use SELECT with WHERE instead of SELECT *.
• Avoid nested loops.
• Use sorted/hashed tables where applicable.
• Use parallel cursor technique.

19. Explain the Parallel Cursor Technique.

Used to optimize nested loops by replacing inner loop with pointer-based traversal.

LOOP AT it_head INTO DATA(ls_head).

READ TABLE it_item INTO DATA(ls_item) WITH KEY vbeln = ls_head-vbeln.

ENDLOOP.

20. What is the RAP (Restful ABAP Programming Model)?

Answer:
RAP is modern development framework for building Fiori apps using CDS Views, Behaviors, and Services. It is the future of ABAP in S/4HANA.

Conclusion

The SAP ABAP landscape is evolving rapidly, especially with S/4HANA innovations such as CDS Views, AMDP, and RAP Model. However, core concepts like internal tables, enhancements, and modular programming remain fundamental.

To excel in interviews:

• Master both Classical ABAP and Modern ABAP.
• Practice problem-solving and code optimization.
• Work hands-on in SAP trial systems.

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