小编And*_*rew的帖子

我在MySQL 5.1非规范化表上运行此sql查询.它按照我想要的方式工作,但它可能很慢.我在日期栏中添加了一个索引,但它仍然需要更快.有关如何加快速度的任何建议吗？(或许可以加入？)

SELECT DISTINCT(bucket) AS b,
       (possible_free_slots -
          (SELECT COUNT(availability)
           FROM ip_bucket_list
           WHERE bucket = b
           AND availability = 'used'
           AND tday = 'evening'
           AND day LIKE '2012-12-14%'
           AND network = '10_83_mh1_bucket')) AS free_slots
FROM ip_bucket_list
ORDER BY free_slots DESC;

个别查询很快:

SELECT DISTINCT(bucket) FROM ip_bucket_list;
1024 rows in set (0.05 sec)

 SELECT COUNT(availability) from ip_bucket_list WHERE bucket = 0 AND availability = 'used' AND tday = 'evening' AND day LIKE '2012-12-14%' AND network = '10_83_mh1_bucket';
1 row in set (0.00 …