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Oracle® Database SQL Reference
10g Release 2 (10.2)

Part Number B14200-02
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Function Expressions

You can use any built-in SQL function or user-defined function as an expression. Some valid built-in function expressions are:

LENGTH('BLAKE') 
ROUND(1234.567*43) 
SYSDATE 

See Also:

"SQL Functions" and "Aggregate Functions" for information on built-in functions

A user-defined function expression specifies a call to:

Some valid user-defined function expressions are:

circle_area(radius)
payroll.tax_rate(empno)
hr.employees.comm_pct(dependents, empno)@remote
DBMS_LOB.getlength(column_name)
my_function(DISTINCT a_column)

Restriction on User-Defined Function Expressions You cannot pass arguments of object type or XMLType to remote functions and procedures.