| Oracle9i SQL Reference Release 2 (9.2) Part Number A96540-02 | 
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A variable expression specifies a host variable with an optional indicator variable. This form of expression can appear only in embedded SQL statements or SQL statements processed in an Oracle Call Interface (OCI) program.
variable_expression::=
 
 Some valid variable expressions are:
:employee_name INDICATOR :employee_name_indicator_var :department_location