<s>
A	O
column	B-Application
family	I-Application
is	O
a	O
database	O
object	O
that	O
contains	O
columns	O
of	O
related	O
data	O
.	O
</s>
<s>
It	O
is	O
a	O
tuple	B-Application
(	O
pair	O
)	O
that	O
consists	O
of	O
a	O
key	B-Application
–	I-Application
value	I-Application
pair	I-Application
,	O
where	O
the	O
key	O
is	O
mapped	O
to	O
a	O
value	O
that	O
is	O
a	O
set	O
of	O
columns	O
.	O
</s>
<s>
In	O
analogy	O
with	O
relational	B-Application
databases	I-Application
,	O
a	O
column	B-Application
family	I-Application
is	O
as	O
a	O
"	O
table	O
"	O
,	O
each	O
key-value	B-Application
pair	I-Application
being	O
a	O
"	O
row	O
"	O
.	O
</s>
<s>
Each	O
column	O
is	O
a	O
tuple	B-Application
(	O
triplet	O
)	O
consisting	O
of	O
a	O
column	O
name	O
,	O
a	O
value	O
,	O
and	O
a	O
timestamp	O
.	O
</s>
<s>
In	O
a	O
relational	B-Application
database	I-Application
table	O
,	O
this	O
data	O
would	O
be	O
grouped	O
together	O
within	O
a	O
table	O
with	O
other	O
non-related	O
data	O
.	O
</s>
<s>
Two	O
types	O
of	O
column	B-Application
families	I-Application
exist	O
:	O
</s>
