我有一个非常大(超过80万行)的非规范化MySQL表.简化的架构如下所示:
+-----------+-------------+--------------+--------------+ | ID | PARAM1 | PARAM2 | PARAM3 | +-----------+-------------+--------------+--------------+ | 1 | .04 | .87 | .78 | +-----------+-------------+--------------+--------------+ | 2 | .12 | .02 | .76 | +-----------+-------------+--------------+--------------+ | 3 | .24 | .92 | .23 | +-----------+-------------+--------------+--------------+ | 4 | .65 | .12 | .01 | +-----------+-------------+--------------+--------------+ | 5 | .98 | .45 | .65 | +-----------+-------------+--------------+--------------+
我试图看看是否有一种优化查询的方法,其中我将权重应用于每个PARAM列(权重在0和1之间),然后将它们平均得出计算值SCORE.然后我想ORDER BY计算出的SCORE列.
例如,假设PARAM1的权重为.5,PARAM2的权重为.23,PARAM3的权重为.76,您最终会得到类似于:
SELECT ID, ((PARAM1 * .5) + (PARAM2 * .23) + (PARAM3 * .76)) / 3 …