ABAP CDS Views and Internal Tables

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Questions and Answers

Which statement is used to change the contents of a row of data in an internal table?

Modify table (correct)

Insert table

Append table

Update table

What happens when you use the 'Modify' statement on a standard table in ABAP?

It changes the contents of the specified row. (correct)

It duplicates the existing row.

It removes the specified row.

It always appends a new row.

Which of the following operations will result in an error when applied to an internal table?

Modify a specific row using a field value.

Use 'Modify' with multiple fields.

Use 'Modify' on a sorted table.

Modify a row that does not exist. (correct)

In what scenario would you NOT use the 'Modify' statement on an internal table?

When you want to append a new row. Signup and view all the answers

Which clause must be included to ensure the 'Modify' statement works correctly for a standard internal table?

WHERE to specify which rows to modify. Signup and view all the answers

What is a consequence of using the 'Modify' statement without the 'WHERE' clause?

All rows in the internal table will be updated. Signup and view all the answers

When using 'Modify' to update a row in an internal table, which of the following must be guaranteed?

The row exists in the table. Signup and view all the answers

What is a typical use case for the 'Modify' statement in ABAP?

To change an existing entry based on user input. Signup and view all the answers

Which of the following statements is true when using the expression itab1 = corresponding #( itab2 )?

Fields with the same name and the same type will be copied from itab2 to itab1. Signup and view all the answers

What is a requirement for the expression itab1 = corresponding #( itab2 ) to work correctly?

itab1 and itab2 must have at least one field name in common. Signup and view all the answers

Which data declarations will allow for the assignment between gv_source and gv_target without truncation or rounding? (Select all that apply)

DATA gv_source TYPE p LENGTH 8 DECIMALS 3 to DATA gv_target TYPE p LENGTH 16 DECIMALS 2. Signup and view all the answers

What can happen if fields with the same name but different types are present in itab2 when using itab1 = corresponding #( itab2 )?

They will cause a runtime error. Signup and view all the answers

Which of the following must you consider regarding types when using internal tables?

itab1 and itab2 can have different types as long as names match. Signup and view all the answers

What will be the response when activating a Core Data Service View Entity Data Definition if the field types of the union do not match?

Activation error because the field types of the union do not match. Signup and view all the answers

In which scenarios will the expression itab1 = corresponding #( itab2 ) lead to errors?

When itab1 and itab2 have mismatched types for fields with the same name. Signup and view all the answers

Which select statement would correctly extract the mat field from demo_sales_cds_material_view?

SELECT mat FROM demo_sales_cds_material_view... Signup and view all the answers

Which of the following is classified as a generic internal table type?

STANDARD TABLE Signup and view all the answers

How does the SQL command 'itab1 = corresponding #( itab2 )' determine which fields to copy?

By looking for matching field names and types. Signup and view all the answers

What is one of the outcomes when executing 'itab1 = corresponding #( itab2 )'?

Only fields with similar names and types will be populated in itab1. Signup and view all the answers

What is the variable type of connection_full when defined as DATA connection_full TYPE /DMD/I_Connection?

Structure Signup and view all the answers

What should be the types of itab1 and itab2 when using the expression itab1 = corresponding #( itab2 )?

They have to share at least one common field name. Signup and view all the answers

In the context of ABAP SQL code, which syntax correctly specifies case distinctions?

Using CASE WHEN statements. Signup and view all the answers

What is the primary reason for an activation error in a Core Data Service View?

Field names in the union do not match. Signup and view all the answers

Which of the following describes the use of an internal table type effectively?

An INDEX TABLE can be used for quick access to individual rows. Signup and view all the answers

Study Notes

Core Data Services (CDS)

CDS view entities support parameters.
Parameters are defined using the @ symbol followed by a variable or expression.
Some examples of valid parameters are:
- $session.system_date (system date)
- @ (cl_abap_context_info->get_system_date()) (system date)
- A literal date value in the format YYYYMMDD ('20230101').

CDS Views - Joining

CDS views can be joined based on their fields.
You can use the ON clause in a JOIN statement to define the join condition.
The JOIN clause should reference the fields from the views you want to join.
You cannot use the $projection variable in the ON clause because it represents the view's projection, not individual fields.

ABAP Internal Tables

You can utilize the itab1 = corresponding #( itab2) statement to copy data from one internal table (itab2) to another (itab1).
This statement will copy fields with the same name and data type.
Both tables must have at least one field name in common.

ABAP String Manipulation

You can use ABAP SQL to manipulate strings within a SELECT statement.
The substring, upper, and left functions can be used to extract specific characters from a string.
- substring(upper('mr joe doe'), 4, 3) will extract the substring "JOE" from the string.
- upper(left( 'mr joe doe', 6)) will extract the substring "MR JOE" and convert it to uppercase.

ABAP Data Types

When assigning a variable to another variable, the types must be compatible to avoid truncation or rounding issues.
The TYPE keyword is used to declare a variable's data type.
Examples of data types:
- p - Packed number, c - Character, string - Character string

CDS View Activation Error

A CDS view with a union must have matching field names (same names) and data types (compatible types) for successful activation.
If the field names in the union do not match, the activation will fail. Similarly, if the field types are incompatible, the activation will fail.

ABAP SQL - Selecting From CDS Views

You can select data from a CDS view using SELECT statements in ABAP SQL.
The FROM clause should reference the view name, for example:
- SELECT mat FROM demo_sales_cds_material_ve (select the field named 'mat' from the view demo_sales_cds_material_ve)

ABAP Internal Table Types

There are different types of internal tables in ABAP:
- Standard Table - Default internal table type, no specific ordering.
- Sorted Table - Table with entries ordered by SORT statement.
- Hashed Table - Table with entries accessed using a hash key for fast access.
- Index Table - Table with entries accessed by a specific index number.

ABAP Variables

Variables in ABAP can be declared with different data types:
- Simple variable - Stores a single value.
- Internal table - Stores a collection of rows.
- Structure- Groups data into logical units, similar to classes.

ABAP SQL - Case Distinctions

CASE statements in ABAP SQL allow you to evaluate different conditions and return specific values.
You can use CASE statements to create conditional logic within WHERE clauses and SELECT statements.
Valid case distinctions include WHEN clauses and ELSE clauses.

ABAP Internal Table Sorting

Sorting is performed using the SORT statement.
You can define sorting conditions based on fields and their order (ascending or descending).
SORT itab BY field1 field2 will sort the internal table itab ascending by field1 and then field2.

ABAP Internal Table Modifications

The MODIFY statement is used to modify the contents of an existing row in an internal table.

ABAP Security - Access Control Objects

Access Control Objects (ACOs) define access rights to database tables.
They use clauses like:
- WHERE to define specific conditions for access.
- GRANT to define access rights.
- REVOKE to remove access rights.

ABAP SQL Syntax

Conventions for SELECT statements in ABAP Open SQL:
- The INTO TABLE @gt flights clause should appear after the FIELDS clause within the SELECT statement.

ABAP Predicate Conditions

CAST can be used to convert data types in ABAP.
To ensure a valid CAST operation, the data type being converted should be a SUPPLIED type (meaning it has a value).

ABAP Logical Expression Evaluation

The logical operators in ABAP are evaluated in the following order:
- NOT - highest priority
- AND - medium priority
- OR - lowest priority

ABAP Database Table Definitions

Key parts of defining a database table:
- Field list - Defines the fields and their data types.
- Semantic table attributes - Defines the table's characteristics.
- Extension - Allows you to add custom fields and logic.

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Description

Test your knowledge on Core Data Services (CDS), including the use of parameters and joining views. Additionally, explore the handling of internal tables in ABAP. This quiz covers essential concepts for SAP ABAP developers.