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ABAP_ITAB - Grouping with LOOP Using Column Values This example demonstrates the construction of the group key using simple value assignments.
ABAP_SOURCE_CODE DEMO CL_DEMO_LOOP_GRP_BY_VALUES
ABAP_DESCRIPTION Grouping of an internal table flights with group key binding . The group key of the group loop is constructed as a structure, where the values of the columns carrid or cityfrom of each line of the internal table are assigned to the components carrier and cityfr. This creates groups of lines that have the same value in these columns. Furthermore, the components size and index are created for the special language elements GROUP SIZE or GROUP • to determine the size and index of each group. The group key that is bound to a reference variable group_ref and the additional components are produced in the group loop. In a member loop, the lines of each group are placed in an internal table members using the value operator with the addition BASE. This table is also displayed. members could also be filled by evaluating a table comprehension using FOR ... IN GROUP, instead of in a member loop LOOP AT GROUP: members = VALUE #( FOR < flight> IN GROUP group_ref ( <(> <<)>flight> ) ). The executable example for grouping with FOR demonstrates how the entire group loop can be implemented using expressions.
