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Comprehensive and Detailed Explanation from Exact Extract:

avg(expr) → ✅ Allows numeric expressions (e.g., (f1 + f2) / 2).

sum(expr) → ✅ Accepts numeric expressions.

max() → ❌ Requires a single column, not expressions.

count(*) → ❌ Counts rows only, doesn’t accept expressions.

Study Guide Reference: ABAP SQL Documentation – Aggregate Functions.

Comprehensive and Detailed Explanation from Exact Extract:

Value helps in CDS are defined using annotations like:

@Consumption.valueHelpDefinition: '_association'

This enriches fields with semantic metadata for Fiori/UIs. Associations provide technical links, but the value help definition itself is given by annotations.

Study Guide Reference: ABAP CDS Guide – Annotations for Value Helps.

Comprehensive and Detailed Explanation from Exact Extract:

Execution order when creating an instance of a subclass:

Class constructor of the superclass (super1) executes first.

Class constructor of the subclass (sub1) executes second.

Then the instance constructor of the superclass (super1) executes.

Finally, the instance constructor of the subclass (sub1) executes.

This sequence guarantees that both the static (class-level) and instance-level initializations of the superclass are complete before the subclass is constructed.

Verified Study Guide Reference: ABAP Objects Programming Guide – Class and Instance Constructor Execution Order.

Comprehensive and Detailed Explanation from Exact Extract:

In the ABAP RESTful Application Programming Model (RAP), development follows a bottom-up approach. The sequence starts with the database table (persistence), followed by creating a data model view (interface view), and then a projection view.

The projection view is the next artifact after the database table because it exposes only the fields needed for the app, aligning with the encapsulation principle of RAP. This ensures that only the required subset of the underlying data model is made available.

Verified Study Guide Reference: ABAP RAP Development Guide – Data Modeling and Projection Views.