1
我需要提供一份报告,提供特定周内使用的每种特定促销代码的计数。示例表结构:MySQL中检索给定周内值的最有效方法?
CREATE TABLE `user_promo_codes` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`user_id` bigint(20) unsigned NOT NULL,
`promo_code` longtext NOT NULL,
`last_updated` datetime NOT NULL,
PRIMARY KEY (`id`),
)
我想要的是每个特定星期内使用的特定促销代码的计数。我现在所拥有的:
SELECT promo_code, count(*) AS count
FROM user_promo_codes
WHERE last_updated BETWEEN
FROM_UNIXTIME(# one week ago
UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 7 DAY)) - TIME_TO_SEC(NOW())
)
AND
FROM_UNIXTIME(
UNIX_TIMESTAMP(NOW()) - TIME_TO_SEC(NOW())
)
GROUP BY value
有没有更高效的方法来做到这一点?
您*真的*想让last_updated字段成为索引。 :-) – 2010-12-07 22:14:02