<s>
Object	B-Language
Query	I-Language
Language	I-Language
(	O
OQL	B-Language
)	O
is	O
a	O
query	B-Language
language	I-Language
standard	O
for	O
object-oriented	B-Application
databases	I-Application
modeled	O
after	O
SQL	B-Language
and	O
developed	O
by	O
the	O
Object	B-Application
Data	I-Application
Management	I-Application
Group	I-Application
(	O
ODMG	B-Application
)	O
.	O
</s>
<s>
Because	O
of	O
its	O
overall	O
complexity	O
the	O
complete	O
OQL	B-Language
standard	O
has	O
not	O
yet	O
been	O
fully	O
implemented	O
in	O
any	O
software	O
.	O
</s>
<s>
The	O
OQL	B-Language
standard	O
influenced	O
the	O
design	O
of	O
later	O
query	B-Language
languages	I-Language
such	O
as	O
JDOQL	O
and	O
EJB	B-Language
QL	I-Language
,	O
though	O
none	O
are	O
considered	O
to	O
be	O
any	O
version	O
of	O
OQL	B-Language
.	O
</s>
<s>
The	O
following	O
rules	O
apply	O
to	O
OQL	B-Language
statements	O
:	O
</s>
<s>
A	O
list	O
of	O
entries	O
in	O
OQL	B-Language
is	O
usually	O
separated	O
by	O
commas	O
but	O
not	O
terminated	O
by	O
a	O
comma( , )	O
.	O
</s>
<s>
The	O
following	O
example	O
illustrates	O
how	O
one	O
might	O
retrieve	O
the	O
CPU-speed	O
of	O
all	O
PCs	B-Device
with	O
more	O
than	O
64MB	O
of	O
RAM	B-Architecture
from	O
a	O
fictional	O
PC	B-Device
database	O
:	O
</s>
<s>
The	O
following	O
example	O
illustrates	O
how	O
one	O
might	O
retrieve	O
the	O
average	O
amount	O
of	O
RAM	B-Architecture
on	O
a	O
PC	B-Device
,	O
grouped	O
by	O
manufacturer	O
:	O
</s>
<s>
Note	O
the	O
use	O
of	O
the	O
keyword	O
partition	O
,	O
as	O
opposed	O
to	O
aggregation	O
in	O
traditional	O
SQL	B-Language
.	O
</s>
