SAP ABAP Interview Cheatsheet (Quick Revision Guide)

✅ 1. ABAP Basic Concepts

Data Dictionary: Tables, Views, Search Help, Domains, Data Elements.
Types of Tables:
- Transparent
- Pooled
- Cluster
Internal Tables: STANDARD, SORTED, HASHED.
Work Areas vs Field Symbols vs References.

✅ 2. ABAP OOP (Object Oriented Programming)

Class types: Local/Global (SE24)
Methods, Constructors
Inheritance, Polymorphism
Interfaces
Events & Handlers
Exception Classes (CX_*)

✅ 3. Modularization Techniques

Subroutines (FORM/ENDFORM)
Function Modules – RFC, Normal, Updates.
Methods – Instance & Static.
Badis, User Exits, Customer Exits.

✅ 4. Enhancement Framework

Implicit/Explicit Enhancements
BADIs (Classic + New)
Enhancement Spots
BTEs
User Exits (CMOD/SMOD)

✅ 5. ABAP Dictionary (DDIC)

Domains, Data Elements
Structures / Table Types
Lock Objects
Search Helps
Views (Database, Projection, Maintenance, Help View)
Indexes & Performance

✅ 6. Internal Tables – Must Know

Declaration (TYPE STANDARD TABLE OF…)
Operations: APPEND, COLLECT, INSERT, DELETE, READ TABLE
LOOP AT with WHERE
FIELD-SYMBOLS <fs>
SORT, DELETE ADJACENT DUPLICATES

✅ 7. SQL in ABAP

Open SQL (SELECT, INSERT, UPDATE, MODIFY, DELETE)
Joins (Inner, Left, Right)
Aggregate functions
FOR ALL ENTRIES rules
UP TO n ROWS, ORDER BY, GROUP BY
New SQL: CORRESPONDING, CAST, COALESCE, CONCAT, UNION

✅ 8. ABAP 7.4+ / 7.5+ New Syntax

Hot area in interviews.

Inline declarations (DATA(lv_var)).
New LOOP syntax (LOOP AT it INTO DATA(ls)…)
Constructor expressions:
- VALUE, NEW, REF, REDUCE, COND, SWITCH.
Table expressions (it[ key ]).
FILTER, SORT, GROUP BY.
Boolean expressions.

✅ 9. Performance Tuning

Interview favourite.

Proper indexing
Avoid SELECT *
Buffering tables
Avoid nested SELECTs
Use FOR ALL ENTRIES carefully
Use hashed/sorted tables
Move logic to DB: CDS/AMDP
Parallel Processing via RFC

✅ 10. Reports

Classical Reports
Interactive Reports
ALV Reports
ALV Types:
- REUSE_ALV_GRID
- OO ALV (CL_GUI_ALV_GRID)
Modern: SALV Classes (CL_SALV_TABLE)

✅ 11. SmartForms & Adobe Forms

SMARTFORMS:
- Driver program, Form interface, Windows, Logic
Adobe Forms:
- Interface, Context, Layout, Scripts

✅ 12. BDC / BAPI

BDC Techniques

Session Method
Call Transaction
Direct Input

BAPI

Standardized APIs
Transaction Commit (BAPI_TRANSACTION_COMMIT)
Return Messages (RETURN)

✅ 13. ALE / IDocs

IDoc Types: Basic, Extension
Segments, Message Types
tCodes: WE02, WE05, WE19, WE20
Outbound/Inbound Processing
Partner Profiles

✅ 14. ABAP Web Dynpro

MVC architecture
Context Nodes
Supply Function
UI Elements
Navigation

✅ 15. SAP Script

Layout Sets, Windows
Standard Texts (SO10)
Printer settings

✅ 16. CDS Views (Hot Topic)

Basic + Composite CDS
Associations
Annotations (@AbapCatalog.sqlViewName, @OData.publish)
Joins & Path Expressions
Analytical Views
Access Control (DCL)

✅ 17. AMDP (ABAP Managed DB Procedures)

SQLScript-based DB procedures
Created in Class → METHODS ... BY DATABASE PROCEDURE
Used for heavy data lifting
DB-specific optimizations
Error handling using SQLScript

✅ 18. OData / Gateway

Create Service (SEGW)
Entity Set, Model Provider Class (MPC), Data Provider Class (DPC)
CRUD operations (GET_ENTITY, GET_ENTITYSET, CREATE_ENTITY, UPDATE_ENTITY)
Deep Entity
$filter, $expand, $metadata

✅ 19. ABAP Debugging & Tools

Classic Debugger vs New Debugger
Breakpoints (Static, Dynamic, Conditional)
Watchpoints
ST05 – SQL Trace
SAT – Runtime Analysis
SCI/SLIN – Code Inspector

✅ 20. Hot Scenario-Based Questions

These ALWAYS come:

How will you optimize a slow ABAP report?
Difference between HASHED, SORTED and STANDARD tables?
How to avoid duplicates while appending internal tables?
How do you debug an IDoc failure?
What is the best way to handle mass data processing?
How to decide between BAPI and BDC?
Explain a real time enhancement you implemented.
How to convert classical report to ALV?
When to use CDS view vs AMDP?
How do you activate OData service?

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