mysql语法问题

[crazyday7]

SELECT (`aaa`/`bbb`) AS ccc
FROM test
WHERE ccc > 1

搜寻是没问题，但是加上WHERE条件会说[Err] 1054 - Unknown column 'ccc' in 'where clause'，请问要怎么修正?

[xuzuning]

SELECT (`aaa`/`bbb`) AS ccc
FROM test
WHERE `aaa`/`bbb` > 1

或

SELECT (`aaa`/`bbb`) AS ccc
FROM test
HAVING ccc > 1

注意：`aaa`/`bbb` 不会被重复计算