<s>
Business	B-Application
System	I-Application
12	I-Application
,	O
or	O
simply	O
BS12	O
,	O
was	O
one	O
of	O
the	O
first	O
fully	O
relational	B-Application
database	I-Application
management	I-Application
systems	I-Application
,	O
designed	O
and	O
implemented	O
by	O
IBM	O
's	O
Bureau	O
Service	O
subsidiary	O
at	O
the	O
company	O
's	O
international	O
development	O
centre	O
in	O
Uithoorn	O
,	O
Netherlands	O
.	O
</s>
<s>
It	O
was	O
never	O
widely	O
used	O
and	O
essentially	O
disappeared	O
soon	O
after	O
the	O
division	O
was	O
shut	O
down	O
in	O
1985	O
,	O
possibly	O
because	O
IBM	O
and	O
other	O
companies	O
settled	O
on	O
SQL	B-Language
as	O
the	O
standard	O
.	O
</s>
<s>
BS12	O
's	O
lasting	O
contribution	O
to	O
history	O
was	O
the	O
use	O
of	O
a	O
new	O
query	O
language	O
based	O
on	O
ISBL	B-Language
,	O
created	O
at	O
IBM	O
's	O
UK	O
Scientific	O
Centre	O
.	O
</s>
<s>
Developers	O
of	O
the	O
famous	O
System	B-Application
R	I-Application
underway	O
in	O
the	O
US	O
at	O
the	O
same	O
time	O
were	O
also	O
consulted	O
on	O
certain	O
matters	O
concerning	O
the	O
engine	O
,	O
but	O
the	O
BS12	O
team	O
rejected	O
SQL	B-Language
unequivocally	O
,	O
being	O
convinced	O
that	O
this	O
apparently	O
unsound	O
and	O
difficult-to-use	O
language	O
(	O
which	O
at	O
that	O
time	O
was	O
also	O
relationally	O
incomplete	O
)	O
would	O
never	O
catch	O
on	O
.	O
</s>
<s>
BS12	O
included	O
a	O
number	O
of	O
interesting	O
features	O
that	O
have	O
yet	O
to	O
appear	O
on	O
most	O
SQL-based	O
systems	O
,	O
some	O
a	O
consequence	O
of	O
following	O
the	O
ISBL	B-Language
precedent	O
,	O
others	O
due	O
to	O
deliberate	O
design	O
.	O
</s>
<s>
Another	O
feature	O
that	O
could	O
have	O
easily	O
been	O
included	O
in	O
SQL	B-Language
systems	O
was	O
the	O
support	O
for	O
update	O
operations	O
on	O
the	O
catalog	O
tables	O
(	O
system	O
tables	O
describing	O
the	O
structure	O
of	O
the	O
database	O
,	O
as	O
in	O
SQL	B-Language
)	O
.	O
</s>
<s>
In	O
addition	O
,	O
BS12	O
was	O
ahead	O
of	O
SQL	B-Language
in	O
supporting	O
user-defined	O
functions	O
and	O
procedures	O
,	O
using	O
a	O
Turing	B-Algorithm
complete	I-Algorithm
sublanguage	O
,	O
triggers	B-Language
,	O
and	O
a	O
simple	O
"	O
call	O
"	O
interface	O
for	O
use	O
by	O
application	O
programs	O
,	O
all	O
in	O
its	O
very	O
first	O
release	O
in	O
1982	O
.	O
</s>
<s>
Although	O
some	O
SQL	B-Language
dialects	O
support	O
natural	O
joins	O
,	O
for	O
familiarity	O
,	O
the	O
example	O
will	O
show	O
only	O
a	O
"	O
traditional	O
"	O
join	O
.	O
</s>
<s>
Here	O
is	O
the	O
equivalent	O
SQL	B-Language
for	O
comparison	O
:	O
</s>
