What is 'group key' in SAP BC-ABA - ABAP Runtime Environment?

group key - Overview

• Component: BC-ABA

• Component Name: ABAP Runtime Environment

• Description: Value of a data type constructed for each read row in a group key expression when grouping internal tables using LOOP AT itab ... GROUP BY or FOR GROUPS ... OF. All table rows that produce the same value are assigned to each group key. In group level processing for internal tables, the group key is the content of all columns on the left of a column specified after AT.

group key - Details

• 
  Key Concepts: 
  Group key is a feature of the ABAP Runtime Environment (BC-ABA) that allows users to group related data together. It is used to store and manage data in a hierarchical structure, making it easier to access and manipulate. Group keys are used to define relationships between different objects, such as tables, views, and programs. 
  
  How to use it: 
  Group keys are used to define relationships between different objects. To create a group key, the user must first define the objects that will be grouped together. Then, the user must specify the relationship between the objects by assigning a group key to each object. The group key can then be used to access and manipulate the data stored in the objects. 
  
  Tips & Tricks: 
  When creating a group key, it is important to consider how the data will be used. This will help ensure that the group key is properly defined and that it is easy to access and manipulate the data stored in the objects. Additionally, it is important to keep track of all group keys that have been created so that they can be easily accessed when needed. 
  
  Related Information: 
  For more information on group keys and how they are used in the ABAP Runtime Environment (BC-ABA), please refer to SAP's official documentation on the topic. Additionally, there are many online tutorials