<s>
Hyper	O
Text	O
Structured	B-Language
Query	I-Language
Language	I-Language
(	O
HTSQL	B-Language
)	O
is	O
a	O
schema-driven	O
URI-to-SQL	O
query	O
language	O
that	O
takes	O
a	O
request	O
over	O
HTTP	B-Protocol
,	O
converts	O
it	O
to	O
a	O
SQL	B-Language
query	O
,	O
executes	O
the	O
query	O
against	O
a	O
database	O
,	O
and	O
returns	O
the	O
results	O
in	O
a	O
format	O
best	O
suited	O
for	O
the	O
user	O
agent	O
(	O
CSV	O
,	O
HTML	B-Language
,	O
etc	O
.	O
)	O
</s>
<s>
The	O
HTSQL	B-Language
language	O
is	O
implemented	O
on	O
"	O
HTSQL	B-Language
servers	O
,	O
"	O
which	O
use	O
HTSQL	B-Language
to	O
convert	O
web	O
requests	O
into	O
equivalent	O
SQL	B-Language
,	O
executes	O
requests	O
on	O
a	O
server-side	O
database	O
,	O
and	O
returns	O
results	O
in	O
XML	B-Protocol
,	O
HTML	B-Language
,	O
CSV	O
,	O
JSON	B-General_Concept
,	O
or	O
YAML	B-Protocol
formats	O
.	O
</s>
<s>
The	O
current	O
implementation	O
as	O
of	O
April	O
2010	O
uses	O
Python	B-Language
and	O
works	O
with	O
PostgreSQL	B-Application
,	O
MySQL	B-Application
,	O
SQLite	B-Language
,	O
Oracle	B-General_Concept
,	O
and	O
Microsoft	B-Application
SQL	I-Application
Server	I-Application
databases	O
.	O
</s>
<s>
HTSQL	B-Language
was	O
prototyped	O
and	O
developed	O
by	O
Clark	B-Protocol
Evans	I-Protocol
(	O
who	O
proposed	O
YAML	B-Protocol
in	O
2001	O
)	O
and	O
implemented	O
by	O
Kirill	O
Simonov	O
,	O
both	O
of	O
Prometheus	O
Research	O
.	O
</s>
<s>
HTSQL	B-Language
's	O
intended	O
audience	O
is	O
business	O
users	O
who	O
are	O
not	O
SQL	B-Language
programmers	O
.	O
</s>
<s>
The	O
goal	O
is	O
not	O
completeness	O
in	O
replicating	O
SQL	B-Language
,	O
but	O
simplicity	O
and	O
intuitiveness	O
.	O
</s>
<s>
HTSQL	B-Language
allows	O
users	O
who	O
are	O
familiar	O
with	O
the	O
data	O
,	O
but	O
not	O
SQL	B-Language
syntax	O
,	O
to	O
directly	O
access	O
the	O
database	O
without	O
going	O
through	O
an	O
application	O
.	O
</s>
<s>
HTSQL	B-Language
uses	O
a	O
URI-based	O
query	O
syntax	O
.	O
</s>
<s>
The	O
result	O
of	O
this	O
query	O
from	O
the	O
HTSQL	B-Language
command-line	O
system	O
is	O
:	O
</s>
<s>
HTSQL	B-Language
can	O
be	O
used	O
for	O
ad	O
hoc	O
database	O
queries	O
.	O
</s>
<s>
Its	O
developers	O
consider	O
it	O
to	O
be	O
more	O
concise	O
and	O
intuitive	O
and	O
therefore	O
less	O
error-prone	O
than	O
SQL	B-Language
for	O
non-technical	O
users	O
.	O
</s>
<s>
HTSQL	B-Language
can	O
also	O
be	O
used	O
by	O
"	O
accidental	O
programmers	O
"	O
,	O
such	O
as	O
data	O
analysts	O
and	O
UI	O
developers	O
.	O
</s>
<s>
Besides	O
more	O
readable	O
,	O
HTTP-based	O
queries	O
,	O
HTSQL	B-Language
's	O
developers	O
claim	O
it	O
helps	O
avoid	O
common	O
SQL	B-Language
mistakes	O
like	O
accidental	O
joins	O
.	O
</s>
<s>
HTSQL	B-Language
follows	O
a	O
dual	O
license	O
model	O
.	O
</s>
<s>
The	O
software	O
may	O
be	O
used	O
free	O
of	O
charge	O
with	O
open	O
source	O
relational	O
databases	O
,	O
including	O
MySQL	B-Application
and	O
PostgreSQL	B-Application
.	O
</s>
<s>
Source	O
code	O
is	O
available	O
on	O
the	O
bitbucket	B-Protocol
site	O
.	O
</s>
<s>
A	O
commercial	O
version	O
of	O
HTSQL	B-Language
,	O
compatible	O
with	O
commercial	O
databases	O
like	O
Oracle	B-General_Concept
and	O
Microsoft	B-Application
SQL	I-Application
Server	I-Application
,	O
is	O
also	O
available	O
.	O
</s>
