缓慢查询与OR在哪里条款

Question

请告知如何改善这种缓慢的查询。

SELECT response.`reasonid` 
FROM response 
    INNER JOIN ACTION ON action.actionid = response.actionid 
WHERE 
    response.respdate BETWEEN 20160305 
    AND 20160905 
    AND 
    (
     (
     response.reasonid = 'Prospect Call' 
     AND response.typeid = '0' 
     AND action.typeid = '9' 
     ) 
    OR 
     (
     response.typeid = '1000' 
     AND action.typeid = '1' 
     ) 
    ) 

上有索引：

response.actionid/response.reasonid/response.typeid/action.typeid/response.respdate

解释结果：

table type possible_keys     key   key_len ref    rows Extra 

ACTION range PRIMARY,idx_actiontypeid idx_actiontypeid 5  \N    310617 Using where; Using index 
response ref idx_respdate2,idx_actionid, idx_actionid  5  ACTION.actionid 1   Using where 
      idx_reasonid,idx_resptypeid 

Answer 1

你的查询不应该有它的单独索引，但一个复合或甚至覆盖索引。我很惊讶没有人评论过。我为指标

表索引 响应（typeid的，respdate，合理，actionid） 行动（actionid，typeid的）

后来我调整了查询​​使用UNION代替OR

以下建议

select distinct 
     r.reasonid 
    from 
     response r join action a 
     on r.actionid = a.actionid 
     AND a.typeid = 9 
    where 
      r.typeid = 0 
     and r.respdate between 20160305 and 20160905 
     and r.reasonid = 'Prospect Call' 
union 
select 
     r.reasonid 
    from 
     response r join action a 
     on r.actionid = a.actionid 
     AND a.typeid = 1 
    where 
      r.typeid = 1000 
     and r.respdate between 20160305 and 20160905 

Answer 2

试此查询添加了一些索引列加入

SELECT response.`reasonid` 
FROM response 
    INNER JOIN ACTION ON action.actionid = response.actionid and response.typeid in('1000','0') and action.typeid in('0','1') 
WHERE 
    response.respdate BETWEEN 20160305 
    AND 20160905 
    AND 
    (
     (
     response.reasonid = 'Prospect Call' 
     AND response.typeid = '0' 
     AND action.typeid = '9' 
     ) 
    OR 
     (
     response.typeid = '1000' 
     AND action.typeid = '1' 
     ) 
    ) 

Answer 3

试一下： 减少表下来的大小，只需要使用什么：

select a.* 
from (
     SELECT response.`reasonid` 
     FROM response 
     WHERE response.respdate BETWEEN 20160305 AND 20160905 
    ) a 
INNER JOIN ACTION ON action.actionid = a.actionid 
WHERE (
    response.reasonid = 'Prospect Call' 
    AND response.typeid = '0' 
    AND action.typeid = '9' 
    ) 
OR 
    (
    response.typeid = '1000' 
    AND action.typeid = '1' 
    ) 

Answer 4

请尽量在查询中指定的日期，因为它们是在数据库：

SELECT response.`reasonid` 
FROM response 
    INNER JOIN ACTION ON action.actionid = response.actionid 
WHERE 
    response.respdate BETWEEN "2016-03-05" 
    AND "2016-09-05" 
    AND 
    (
     (
     response.reasonid = 'Prospect Call' 
     AND response.typeid = '0' 
     AND action.typeid = '9' 
     ) 
    OR 
     (
     response.typeid = '1000' 
     AND action.typeid = '1' 
     ) 
    ) 

并检查这是否加快您的查询。 如果将其编写为数值（20160305），则数据库在比较每行时必须对每行执行隐式类型转换，这可能会导致性能下降。