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MOVE-CORRESPONDING - itab

Quick Reference

Other versions: 7.31 | 7.40 | 7.54

Syntax


MOVE-CORRESPONDING [EXACT] itab1 TO itab2. 
  [EXPANDING NESTED TABLES] [KEEPING TARGET LINES].

Extras

1. ... EXPANDING NESTED TABLES

2. ... KEEPING TARGET LINES

Effect

This variant of the statement MOVE-CORRESPONDING requires internal tables to be specified for itab1 and itab2. It searches for all similarly named components in the row types of itab1 and itab2 and assigns them from itab1 to itab2 in accordance with the rules below.

  • If the row type is structured, the components are the structure components.
  • A non-structured row type is handled like a structure with a single component. The type of the component is the row type of the internal table (elementary), is a table itself, or is a reference variable. The component has an internal name that is the same for all tables.

If there are components with the same name, the target table itab2 is deleted without the addition KEEPING TARGET LINES and the same number of initial rows are inserted as exist in the source table itab1. The rows of the source table are then extracted sequentially (in the same order as in the statement LOOP) and the content of each row is assigned to the corresponding row in the target table in accordance with the rules for MOVE-CORRESPONDING [EXACT] for structures. Finally, the table keys and associated table indexes are updated (if necessary) in the target table in accordance with the rules insertions in internal tables. The relevant exceptions are raised if uniqueness is violated.

If there are no components with the same name, no assignment is made and the target table is left unchanged.


Notes

  • MOVE-CORRESPONDING never has an effect when an internal table with a non-structured row type is assigned to an internal table with a structured row type (or when the assignment is the other way round).
  • Without additions, MOVE-CORRESPONDING has the same effect on the assignment of an internal table with non-structured row type to a similar table as a regular assignment.
  • If an internal table, itab, is assigned to itself using MOVE-CORRESPONDING, the statement is ignored. This also means that the rows are not deleted first and then filled again.
  • The convertibility of the components, if known, is checked statically. If the convertibility cannot be identified statically, a runtime error is only raised if an assignment is really performed.

Addition 1

... EXPANDING NESTED TABLES

Effect

If this addition is specified, the individual rows are assigned in accordance with the rules for MOVE-CORRESPONDING [EXACT] with EXPANDING NESTED TABLES specified, and tabular components are resolved at every hierarchy level.

If the addition is not specified, the individual rows are assigned in accordance with the rules for MOVE-CORRESPONDING [EXACT] without EXPANDING NESTED TABLES specified, and tabular components are assigned in accordance with the rules for assignments or lossless assignments.

Addition 2

... KEEPING TARGET LINES

Effect

This addition stops the target table itab2 from being deleted. Instead, it appends the same number of initial rows as exist in the source table itab1. The rows of the source tables are then mapped to these rows. The table keys and indexes are then updated across all rows. If no identically named components are found, the target table remains unchanged.


Note

The addition KEEPING TARGET LINES is only effective on the rows of itab2. It cannot be effective on nested tables, even when specified with the addition EXPANDING NESTED TABLES. This is because nested tables are always resolved in new initial rows.


Example

Assignment of four identically named components of standard table spfli_tab to a sorted table flights.

TYPES: 
  BEGIN OF flight, 
    carrid TYPE spfli-carrid, 
    connid   TYPE spfli-connid, 
    cityfrom TYPE spfli-cityfrom, 
    cityto   TYPE spfli-cityto, 
  END OF flight. 
DATA 
  flights TYPE SORTED TABLE OF flight WITH UNIQUE KEY carrid connid. 

SELECT * 
       FROM spfli 
       INTO TABLE @DATA(spfli_tab). 

MOVE-CORRESPONDING spfli_tab TO flights. 

cl_demo_output=>display( flights ).

Executable Example

MOVE-CORRESPONDING for Internal Tables