A character string literal, numeric literal, or date literal. You
    can use a literal as a value expression. For example:

    FOR E IN EMPLOYEES WITH E.LAST_NAME = "Toliver"
       PRINT E.EMPLOYEE_ID                 -------
    END_FOR                                   |
                                        string literal

    FOR S IN SALARY_HISTORY WITH S.SALARY_AMOUNT > 40000
       PRINT S.EMPLOYEE_ID                         -----
    END_FOR                                          |
                                              numeric literal

    FOR S IN SALARY_HISTORY WITH S.SALARY_START = "9-APR-1980"
       PRINT S.EMPLOYEE_ID                         ----------
    END_FOR                                             |
                                                  date literal