<s>
In	O
the	O
context	O
of	O
a	O
relational	B-Application
database	I-Application
,	O
a	O
row	O
—	O
also	O
called	O
a	O
tuple	B-Application
—	O
represents	O
a	O
single	O
,	O
implicitly	O
structured	O
data	O
item	O
in	O
a	O
table	B-Application
.	O
</s>
<s>
In	O
simple	O
terms	O
,	O
a	O
database	B-Application
table	I-Application
can	O
be	O
thought	O
of	O
as	O
consisting	O
of	O
rows	O
and	O
columns	B-Application
.	O
</s>
<s>
Each	O
row	O
in	O
a	O
table	B-Application
represents	O
a	O
set	O
of	O
related	O
data	O
,	O
and	O
every	O
row	O
in	O
the	O
table	B-Application
has	O
the	O
same	O
structure	O
.	O
</s>
<s>
For	O
example	O
,	O
in	O
a	O
table	B-Application
that	O
represents	O
companies	O
,	O
each	O
row	O
would	O
represent	O
a	O
single	O
company	O
.	O
</s>
<s>
Columns	B-Application
might	O
represent	O
things	O
like	O
company	O
name	O
,	O
company	O
street	O
address	O
,	O
whether	O
the	O
company	O
is	O
publicly	O
held	O
,	O
its	O
VAT	O
number	O
,	O
etc	O
.	O
</s>
<s>
In	O
a	O
table	B-Application
that	O
represents	O
the	O
association	O
of	O
employees	O
with	O
departments	O
,	O
each	O
row	O
would	O
associate	O
one	O
employee	O
with	O
one	O
department	O
.	O
</s>
<s>
The	O
implicit	O
structure	O
of	O
a	O
row	O
,	O
and	O
the	O
meaning	O
of	O
the	O
data	O
values	O
in	O
a	O
row	O
,	O
requires	O
that	O
the	O
row	O
be	O
understood	O
as	O
providing	O
a	O
succession	O
of	O
data	O
values	O
,	O
one	O
in	O
each	O
column	O
of	O
the	O
table	B-Application
.	O
</s>
<s>
The	O
row	O
is	O
then	O
interpreted	O
as	O
a	O
relvar	B-Application
composed	O
of	O
a	O
set	O
of	O
tuples	B-Application
,	O
with	O
each	O
tuple	B-Application
consisting	O
of	O
the	O
two	O
items	O
:	O
the	O
name	O
of	O
the	O
relevant	O
column	O
and	O
the	O
value	O
this	O
row	O
provides	O
for	O
that	O
column	O
.	O
</s>
