<s>
A	O
query	B-Language
language	I-Language
,	O
also	O
known	O
as	O
data	O
query	B-Language
language	I-Language
or	O
database	B-Language
query	I-Language
language	I-Language
(	O
DQL	O
)	O
,	O
is	O
a	O
computer	B-Language
language	I-Language
used	O
to	O
make	O
queries	B-Library
in	O
databases	O
and	O
information	O
systems	O
.	O
</s>
<s>
A	O
well	O
known	O
example	O
is	O
the	O
Structured	B-Language
Query	I-Language
Language	I-Language
(	O
SQL	B-Language
)	O
.	O
</s>
<s>
Broadly	O
,	O
query	B-Language
languages	I-Language
can	O
be	O
classified	O
according	O
to	O
whether	O
they	O
are	O
database	B-Language
query	I-Language
languages	I-Language
or	O
information	B-Language
retrieval	I-Language
query	I-Language
languages	I-Language
.	O
</s>
<s>
The	O
difference	O
is	O
that	O
a	O
database	B-Language
query	I-Language
language	I-Language
attempts	O
to	O
give	O
factual	O
answers	O
to	O
factual	O
questions	O
,	O
while	O
an	O
information	B-Language
retrieval	I-Language
query	I-Language
language	I-Language
attempts	O
to	O
find	O
documents	O
containing	O
information	O
that	O
is	O
relevant	O
to	O
an	O
area	O
of	O
inquiry	O
.	O
</s>
<s>
Other	O
types	O
of	O
query	B-Language
languages	I-Language
include	O
:	O
</s>
<s>
The	O
simplest	O
query	B-Language
language	I-Language
is	O
treating	O
all	O
terms	O
as	O
bag	O
of	O
words	O
that	O
are	O
to	O
be	O
matched	O
with	O
the	O
postings	O
in	O
the	O
inverted	B-Algorithm
index	I-Algorithm
and	O
where	O
subsequently	O
ranking	O
models	O
are	O
applied	O
to	O
retrieve	O
the	O
most	O
relevant	O
documents	O
.	O
</s>
<s>
A	O
query	B-Language
language	I-Language
that	O
also	O
supports	O
the	O
use	O
of	O
the	O
Boolean	O
operators	O
AND	O
,	O
OR	O
,	O
NOT	O
.	O
</s>
<s>
A	O
query	B-Language
language	I-Language
that	O
supports	O
natural	O
language	O
by	O
parsing	O
the	O
natural	O
language	O
query	B-Library
to	O
a	O
form	O
that	O
can	O
be	O
best	O
used	O
to	O
retrieve	O
relevant	O
documents	O
,	O
for	O
example	O
with	O
Question	B-Algorithm
answering	I-Algorithm
systems	I-Algorithm
or	O
conversational	B-Protocol
search	I-Protocol
.	O
</s>
<s>
Attempto	B-General_Concept
Controlled	I-General_Concept
English	I-General_Concept
is	O
a	O
query	B-Language
language	I-Language
that	O
is	O
also	O
a	O
controlled	B-General_Concept
natural	I-General_Concept
language	I-General_Concept
.	O
</s>
<s>
AQL	O
is	O
a	O
query	B-Language
language	I-Language
for	O
the	O
ArangoDB	B-Operating_System
native	O
multi-model	O
database	O
system	O
.	O
</s>
<s>
.QL	B-Language
is	O
a	O
proprietary	O
object-oriented	O
query	B-Language
language	I-Language
for	O
querying	O
relational	B-Application
databases	I-Application
;	O
successor	O
of	O
Datalog	B-Language
;	O
</s>
<s>
CodeQL	B-Language
is	O
the	O
analysis	O
engine	O
used	O
by	O
developers	O
to	O
automate	O
security	O
checks	O
,	O
and	O
by	O
security	O
researchers	O
to	O
perform	O
variant	O
analysis	O
on	O
GitHub	B-Application
.	O
</s>
<s>
Contextual	B-Language
Query	I-Language
Language	I-Language
(	O
CQL	O
)	O
a	O
formal	O
language	O
for	O
representing	O
queries	B-Library
to	O
information	B-Library
retrieval	I-Library
systems	I-Library
such	O
as	O
web	O
indexes	O
or	O
bibliographic	O
catalogues	O
.	O
</s>
<s>
Cypher	B-Language
is	O
a	O
query	B-Language
language	I-Language
for	O
the	O
Neo4j	B-Language
graph	O
database	O
;	O
</s>
<s>
DMX	B-Algorithm
is	O
a	O
query	B-Language
language	I-Language
for	O
data	B-Application
mining	I-Application
models	O
;	O
</s>
<s>
Datalog	B-Language
is	O
a	O
query	B-Language
language	I-Language
for	O
deductive	B-General_Concept
databases	I-General_Concept
;	O
</s>
<s>
F-logic	B-Language
is	O
a	O
declarative	O
object-oriented	O
language	O
for	O
deductive	B-General_Concept
databases	I-General_Concept
and	O
knowledge	O
representation	O
.	O
</s>
<s>
FQL	B-Application
enables	O
you	O
to	O
use	O
a	O
SQL-style	O
interface	O
to	O
query	B-Library
the	O
data	O
exposed	O
by	O
the	O
Graph	O
API	O
.	O
</s>
<s>
Gellish	O
English	O
is	O
a	O
language	O
that	O
can	O
be	O
used	O
for	O
queries	B-Library
in	O
Gellish	O
English	O
Databases	O
,	O
for	O
dialogues	O
(	O
requests	O
and	O
responses	O
)	O
as	O
well	O
as	O
for	O
information	O
modeling	O
and	O
knowledge	O
modeling	O
;	O
</s>
<s>
Gremlin	B-Language
is	O
an	O
Apache	O
Software	O
Foundation	O
graph	O
traversal	O
language	O
for	O
OLTP	O
and	O
OLAP	B-Application
graph	O
systems	O
.	O
</s>
<s>
GraphQL	B-Language
is	O
a	O
data	O
query	B-Language
language	I-Language
developed	O
by	O
Facebook	B-Application
as	O
an	O
alternate	O
to	O
REST	O
and	O
ad-hoc	O
webservice	O
architectures	O
.	O
</s>
<s>
HTSQL	B-Language
is	O
a	O
query	B-Language
language	I-Language
that	O
translates	O
HTTP	B-Protocol
queries	B-Library
to	O
SQL	B-Language
;	O
</s>
<s>
ISBL	B-Language
is	O
a	O
query	B-Language
language	I-Language
for	O
PRTV	B-Application
,	O
one	O
of	O
the	O
earliest	O
relational	B-Application
database	I-Application
management	O
systems	O
;	O
</s>
<s>
Jaql	B-Application
is	O
a	O
functional	O
data	O
processing	O
and	O
query	B-Language
language	I-Language
most	O
commonly	O
used	O
for	O
JSON	B-General_Concept
query	B-Library
processing	O
;	O
</s>
<s>
jq	B-Language
is	O
a	O
functional	O
programming	O
language	O
often	O
used	O
for	O
processing	O
queries	B-Library
against	O
one	O
or	O
more	O
JSON	B-General_Concept
documents	O
,	O
including	O
very	O
large	O
ones	O
;	O
</s>
<s>
JSONiq	B-General_Concept
is	O
a	O
declarative	O
query	B-Language
language	I-Language
designed	O
for	O
collections	O
of	O
JSON	B-General_Concept
documents	O
;	O
</s>
<s>
LDAP	B-Protocol
is	O
an	O
application	B-Application
protocol	I-Application
for	O
querying	O
and	O
modifying	O
directory	O
services	O
running	O
over	O
TCP/IP	B-Protocol
;	O
</s>
<s>
LogiQL	O
is	O
a	O
variant	O
of	O
Datalog	B-Language
and	O
is	O
the	O
query	B-Language
language	I-Language
for	O
the	O
LogicBlox	O
system	O
.	O
</s>
<s>
MQL	O
is	O
a	O
cheminformatics	O
query	B-Language
language	I-Language
for	O
a	O
substructure	O
search	O
allowing	O
beside	O
nominal	O
properties	O
also	O
numerical	O
properties	O
;	O
</s>
<s>
MDX	B-Language
is	O
a	O
query	B-Language
language	I-Language
for	O
OLAP	B-Application
databases	O
;	O
</s>
<s>
N1QL	B-Operating_System
is	O
a	O
Couchbase	B-Operating_System
's	O
query	B-Language
language	I-Language
finding	O
data	O
in	O
Couchbase	B-Operating_System
Servers	I-Operating_System
;	O
</s>
<s>
OCL	B-Language
(	O
Object	B-Language
Constraint	I-Language
Language	I-Language
)	O
.	O
</s>
<s>
Despite	O
its	O
name	O
,	O
OCL	B-Language
is	O
also	O
an	O
object	B-Language
query	I-Language
language	I-Language
and	O
an	O
OMG	B-Architecture
standard	O
;	O
</s>
<s>
OPath	O
,	O
intended	O
for	O
use	O
in	O
querying	O
WinFS	B-Application
Stores	O
;	O
</s>
<s>
Poliqarp	O
Query	B-Language
Language	I-Language
is	O
a	O
special	O
query	B-Language
language	I-Language
designed	O
to	O
analyze	O
annotated	O
text	O
.	O
</s>
<s>
PQL	B-Language
is	O
a	O
special-purpose	B-Language
programming	I-Language
language	I-Language
for	O
managing	O
process	O
models	O
based	O
on	O
information	O
about	O
scenarios	O
that	O
these	O
models	O
describe	O
;	O
</s>
<s>
PRQL	O
(	O
Pipelined	O
Relational	B-Application
Query	I-Application
Language	O
)	O
is	O
a	O
modern	O
language	O
for	O
transforming	O
data	O
.	O
</s>
<s>
PTQL	B-Language
based	O
on	O
relational	B-Application
queries	I-Application
over	O
program	O
traces	O
,	O
allowing	O
programmers	O
to	O
write	O
expressive	O
,	O
declarative	O
queries	B-Library
about	O
program	O
behavior	O
.	O
</s>
<s>
QUEL	B-Language
is	O
a	O
relational	B-Application
database	I-Application
access	O
language	O
,	O
similar	O
in	O
most	O
ways	O
to	O
SQL	B-Language
;	O
</s>
<s>
RDQL	B-Language
is	O
a	O
RDF	B-Language
query	I-Language
language	I-Language
;	O
</s>
<s>
SPARQL	B-Language
is	O
a	O
query	B-Language
language	I-Language
for	O
RDF	O
graphs	O
;	O
</s>
<s>
SQL	B-Language
is	O
a	O
well	O
known	O
query	B-Language
language	I-Language
and	O
data	B-Language
manipulation	I-Language
language	I-Language
for	O
relational	B-Application
databases	I-Application
;	O
</s>
<s>
XQuery	B-Language
is	O
a	O
query	B-Language
language	I-Language
for	O
XML	B-Application
data	I-Application
sources	I-Application
;	O
</s>
<s>
XPath	B-Language
is	O
a	O
declarative	O
language	O
for	O
navigating	O
XML	O
documents	O
;	O
</s>
<s>
YQL	B-Application
is	O
an	O
SQL-like	O
query	B-Language
language	I-Language
created	O
by	O
Yahoo	B-Application
!	I-Application
</s>
