Хотя я полностью согласен с @TheImpaler, вот KLUDGE для создания гистограммы:
mysql> SELECT city, population, REPEAT('x', population/200000) FROM `us` ORDER BY population DESC;
+----------------------------+------------+-------------------------------------------+
| city | population | REPEAT('x', population/200000) |
+----------------------------+------------+-------------------------------------------+
| New York | 8107916 | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| Los Angeles | 3877129 | xxxxxxxxxxxxxxxxxxx |
| Chicago | 2841952 | xxxxxxxxxxxxxx |
| Houston | 2027712 | xxxxxxxxxx |
| Philadelphia | 1453268 | xxxxxxx |
| Phoenix | 1428509 | xxxxxxx |
| San Diego | 1287050 | xxxxxx |
| San Antonio | 1256810 | xxxxxx |
| Dallas | 1211704 | xxxxxx |
| San Jose | 897460 | xxxx |
(даже не думайте о круговой диаграмме!)