Finding the lowest value in a table greater than a certain value

Question

Say I have the following data

Name      Value
===============
Small        10
Medium      100
Large      1000

Imagine that these represent the

Answer 1

WITH ranges_table AS
     (SELECT     LEVEL * 100 AS range_value
            FROM DUAL
      CONNECT BY LEVEL <= 20)
SELECT MIN (range_value)
  FROM ranges_table
 WHERE range_value >= 5 OR range_value = (SELECT MAX (range_value)
                                            FROM ranges_table)