<para>
Any built-in system, or user-defined operator may be used in SQL.
For the list of built-in and system operators consult
- <xref linkend="operators" endterm="operators">.
+ <xref linkend="operators" endterm="operators-title">.
For a list of user-defined operators consult your system administrator
or run a query on the <literal>pg_operator</literal> class.
Parentheses may be used for arbitrary grouping of operators in expressions.
<para>
<acronym>SQL92</acronym> allows <firstterm>expressions</firstterm>
to transform data in tables. Expressions may contain operators
- (see <xref linkend="operators-title" endterm="operators-title">
+ (see <xref linkend="operators" endterm="operators-title">
for more details) and functions
- (<xref linkend="functions-title" endterm="functions-title"> has
+ (<xref linkend="functions" endterm="functions-title"> has
more information).
</para>