Answer Posted / rohit.sapmm

The cardinality (n:m) describes the foreign key
relationship with regard to the number of possible
dependent records (records of the foreign key table) or
referenced records (records of the check
table).
The left side (n) of the cardinality is defined as follows:

n=1: There is exactly one record assigned to the check
table for each record of the
foreign key table.

n=C: The foreign key table may contain records which do
not correspond to any record of
the check table because the foreign key field is empty.
This can occur for example if the
field of the foreign key table is optional, in which case
it does not have to be filled.
The right side (m) of the cardinality is defined as follows:

m=1: There is exactly one dependent record for each
record of the check table.

m=C: There is at most one dependent record for each
record of the check table.

m=N: There is at least one dependent record for each
record of the check table.

m=CN: There may be any number of dependent records for
each record of the check
table.

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