<s>
In	O
systems	O
analysis	O
,	O
a	O
one-to-many	B-Application
relationship	O
is	O
a	O
type	O
of	O
cardinality	B-Application
that	O
refers	O
to	O
the	O
relationship	O
between	O
two	O
entities	O
(	O
see	O
also	O
entity	B-Architecture
–	I-Architecture
relationship	I-Architecture
model	I-Architecture
)	O
A	O
and	O
B	O
in	O
which	O
an	O
element	O
of	O
A	O
may	O
be	O
linked	O
to	O
many	O
elements	O
of	O
B	O
,	O
but	O
a	O
member	O
of	O
B	O
is	O
linked	O
to	O
only	O
one	O
element	O
of	O
A	O
.	O
</s>
<s>
In	O
a	O
relational	B-Application
database	I-Application
,	O
a	O
one-to-many	B-Application
relationship	O
exists	O
when	O
one	O
row	O
in	O
table	O
A	O
may	O
be	O
linked	O
with	O
many	O
rows	O
in	O
table	O
B	O
,	O
but	O
one	O
row	O
in	O
table	O
B	O
is	O
linked	O
to	O
only	O
one	O
row	O
in	O
table	O
A	O
.	O
</s>
<s>
It	O
is	O
important	O
to	O
note	O
that	O
a	O
one-to-many	B-Application
relationship	O
is	O
not	O
a	O
property	O
of	O
the	O
data	O
,	O
but	O
rather	O
of	O
the	O
relationship	O
itself	O
.	O
</s>
<s>
A	O
list	O
of	O
authors	O
and	O
their	O
books	O
may	O
happen	O
to	O
describe	O
books	O
with	O
only	O
one	O
author	O
,	O
in	O
which	O
case	O
one	O
row	O
of	O
the	O
books	O
table	O
will	O
refer	O
to	O
only	O
one	O
row	O
of	O
the	O
authors	O
table	O
,	O
but	O
the	O
relationship	O
itself	O
is	O
not	O
one-to-many	B-Application
,	O
because	O
books	O
may	O
have	O
more	O
than	O
one	O
author	O
,	O
forming	O
a	O
many-to-many	B-Application
relationship	O
.	O
</s>
<s>
The	O
opposite	O
of	O
one-to-many	B-Application
is	O
many-to-one	B-Application
.	O
</s>
<s>
The	O
transpose	O
of	O
a	O
one-to-many	B-Application
relationship	O
is	O
a	O
many-to-one	B-Application
relationship	O
.	O
</s>
<s>
One	O
notation	O
as	O
described	O
in	O
Entity	B-Architecture
Relationship	I-Architecture
modeling	I-Architecture
is	O
Chen	B-Architecture
notation	I-Architecture
or	O
formally	O
Chen	O
ERD	O
notation	O
created	O
originally	O
by	O
Peter	O
Chen	O
in	O
1976	O
where	O
a	O
one-to-many	B-Application
relationship	O
is	O
notated	O
as	O
1:N	O
where	O
N	O
represents	O
the	O
cardinality	B-Application
and	O
can	O
be	O
0	O
or	O
higher	O
.	O
</s>
<s>
A	O
many-to-one	B-Application
relationship	O
is	O
sometimes	O
notated	O
as	O
N:1	O
.	O
</s>
