SAP ABAP Data Element CARDLEFT (Cardinality of a relationship)

Hierarchy

☛ SAP_BASIS (Software Component) SAP Basis Component
   ⤷ BC-DWB-DIC-AC (Application Component) Activation Program, Conversion Program, DB Utility, MC, SPDD
     ⤷ SDTB (Package) ABAP/4 Dictionary: Tables

Basic Data

Data Element	CARDLEFT
Short Description	Cardinality of a relationship

Data Type

Category of Dictionary Type	D	Domain
Type of Object Referenced		No Information
Domain / Name of Reference Type	CARDLEFT
Data Type	CHAR	Character String
Length	2
Decimal Places	0
Output Length	1
Value Table

Further Characteristics

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Parameter ID
Default Component name
Change document	☐
No Input History	☐
Basic direction is set to LTR	☐
No BIDI Filtering	☐

Field Label

	Length	Field Label
Short	10	Card
Medium	18	Cardinality
Long	20	Cardinality
Heading	4	Cd

Documentation

Definition

The cardinality (n : m) describes the foreign key relationship with regard to the number of possible dependent records involved (records of the foreign key table) or referred records (records of the check table).

The left side of the cardinality has the following significance:

• n = 1

  For each dependent record there is exactly one record of the check table.

• n = C

  There can be records in the foreign key talbe which do not reference any record of the check table.

Note:
The definition of a generic foreign key means that the cardinalties (1 : m) and (C : m) actually become (CN : m). There can be several records of the check table for each dependent record. The value n = CN cannot however be specified explicitly in maintenance because a CN : m relationship is equal to a foreign key.

History

Last changed by/on	SAP	19970321
SAP Release Created in