Question

我有这样的查询：

SELECT *,
       CASE
           WHEN text LIKE 'harv' THEN 1
           WHEN text LIKE 'harv%' THEN 2
           WHEN text LIKE '%harv%' THEN 3
       END AS priority
FROM
  ( SELECT b.bschool_name AS `text`,
           'bschool' AS `type`,
           b.slug AS `id`,
           n.neighbourhood AS 'params'
   FROM bschool b
   LEFT JOIN bschool_addresses ba ON (b.id=ba.bschool_id)
   LEFT JOIN neighbourhoods n ON (ba.neighbourhood_id=n.id)
   WHERE b.entity_status = 'active'
     AND ba.city_id='13'
   UNION SELECT tg.option AS `text`,
                'tags' AS `type`,
                tg.option AS `id`,
                tg.option AS 'params'
   FROM tags t
   LEFT JOIN tag_options tg ON (t.id=tg.tag_id)
   WHERE t.tag='MBA'
   UNION SELECT category AS `text`,
                'category' AS `type`,
                category AS `id`,
                category AS 'params'
   FROM categories
   UNION SELECT area AS `text`,
                'area' AS `type`,
                id AS `id`,
                id AS 'params'
   FROM areas
   WHERE city_id='13'
   UNION SELECT district AS `text`,
                'districts' AS `type`,
                id AS `id`,
                id AS 'params'
   FROM districts
   WHERE city_id='13'
   UNION SELECT neighbourhood AS `text`,
                'neighbourhood' AS `type`,
                id AS `id`,
                id AS 'params'
   FROM neighbourhoods
   WHERE city_id='13' ) AS t1
WHERE `text` LIKE 'harv'
  OR `text` LIKE 'harv%'
  OR `text` LIKE '%harv%'
ORDER BY priority LIMIT 5

基本上，这个问题正在进入排名前5的商学院，这些商学院有文本＆＃34; harv＆＃34;在附近的13区，还有学校提供MBA课程，其中有文字＆＃34; harv＆＃34;。此查询用于自动完成搜索。它耗时超过1秒，我认为autocompelte非常长。我在这个查询中做错了吗？有没有办法优化这个。

说明：

1   PRIMARY <derived2>  ALL NULL    NULL    NULL    NULL    7649    Using where; Using filesort
2   DERIVED ba  ref IDX_76AE73698BAC62AF,IDX_76AE7369A89DB457   IDX_76AE73698BAC62AF    5       7458    Using where
2   DERIVED b   eq_ref  PRIMARY PRIMARY 4   school_live.ba.business_id  1   Using where
2   DERIVED n   eq_ref  PRIMARY PRIMARY 4   school_live.ba.neighbourhood_id 1   
3   UNION   t   ALL NULL    NULL    NULL    NULL    22  Using where
3   UNION   tg  ref IDX_E204D72DBAD26311    IDX_E204D72DBAD26311    5   school_live.t.id    4   
4   UNION   categories  ALL NULL    NULL    NULL    NULL    5   
5   UNION   areas   ref IDX_58B0B25C8BAC62AF    IDX_58B0B25C8BAC62AF    5       5   Using where
6   UNION   districts   ref IDX_68E318DC8BAC62AF    IDX_68E318DC8BAC62AF    5       5   Using where
7   UNION   neighbourhoods  ref IDX_49F0CA178BAC62AF    IDX_49F0CA178BAC62AF    5       422 Using where
NULL    UNION RESULT    <union2,3,4,5,6,7>  ALL NULL    NULL    NULL    NULL    NULL

自动完成mysql查询需要很长时间

0 个答案: