<s>
A	O
relational	B-Application
database	I-Application
management	I-Application
system	I-Application
uses	O
SQL	B-Language
conditions	O
or	O
expressions	O
in	O
clauses	O
and	O
in	O
clauses	O
to	O
subsets	O
of	O
data	O
.	O
</s>
<s>
The	O
EXISTS	O
condition	O
uses	O
the	O
SQL	B-Language
standard	I-Language
keyword	O
EXISTS	O
to	O
determine	O
whether	O
rows	O
exist	O
in	O
a	O
subquery	O
result	O
.	O
</s>
