Mysql SQL加入大数据

我有这样的想法：

SELECT a.* 
FROM `entities_instance` a  
 INNER JOIN `instance_fields_data` artists 
 ON ( a.entity_instance_id = artists.entity_instance_id 
      AND artists.`dynamic_field_name` = 'artists' 
      AND artists.`field_value` like '%8605:%')
 INNER JOIN `instance_fields_data` _enddate 
 ON (a.entity_instance_id = _enddate.entity_instance_id) 
    AND (_enddate.`dynamic_field_name` = 'enddate') 
WHERE a.`entity_id` = 67 
GROUP BY a.entity_instance_id
ORDER BY _enddate.field_value DESC 
LIMIT 100

它需要返回大约5个结果，但我得到了以下错误：

The SELECT would examine more than MAX_JOIN_SIZE rows; 
check your WHERE and use SET SQL_BIG_SELECTS=1 or 
SET MAX_JOIN_SIZE=# if the SELECT is okay

有人能帮我改进这个问题吗？ 我不想使用SQL\u BIG\u SELECTS命令

---

谢谢你

网络上的许多资源建议在主查询之前运行

SQL\u BIG\u SELECTS=1

不过，我在想，也许您可以尝试使用别名表来执行数据量较小的联接。不确定，但这可能会有帮助

示例：

select a.* from
(select * from `entities_instance` test WHERE test.`entity_id` = 67) as a
INNER JOIN `instance_fields_data` artists 
 ON ( a.entity_instance_id = artists.entity_instance_id 
      AND artists.`dynamic_field_name` = 'artists' 
      AND artists.`field_value` like '%8605:%')
 INNER JOIN `instance_fields_data` _enddate 
 ON (a.entity_instance_id = _enddate.entity_instance_id) 
    AND (_enddate.`dynamic_field_name` = 'enddate') 
GROUP BY a.entity_instance_id
ORDER BY _enddate.field_value DESC 
LIMIT 100;

有一个数据和表结构的示例将有助于提供更多帮助。 我们甚至不知道哪个表的数据最多

示例2:

select a.* from
(select * from `entities_instance` test WHERE test.`entity_id` = 67) as a
INNER JOIN `instance_fields_data` artists 
 ON ( a.entity_instance_id = artists.entity_instance_id 
      AND artists.`dynamic_field_name` = 'artists' 
      AND artists.`field_value` like '%8605:%')
 INNER JOIN `instance_fields_data` _enddate 
 ON (a.entity_instance_id = _enddate.entity_instance_id) 
    AND (_enddate.`dynamic_field_name` = 'enddate') 
GROUP BY a.entity_instance_id
ORDER BY _enddate.field_value DESC 
LIMIT 100;

这里，我为3个表中的每个表使用where语句，并在别名派生表中使用它们

  SELECT a.*
FROM
  (SELECT *
   FROM `entities_instance` test
   WHERE test.`entity_id` = 67) AS a,

  (SELECT *
   FROM `instance_fields_data` test2
   WHERE test2.`dynamic_field_name` = 'artists'
     AND test2.`field_value` LIKE '%8605:%') AS artists,

  (SELECT *
   FROM `instance_fields_data` test3
   WHERE test3.`dynamic_field_name` = 'enddate') AS _enddate
WHERE a.entity_instance_id = artists.entity_instance_id
  AND a.entity_instance_id = _enddate.entity_instance_id
GROUP BY a.entity_instance_id
ORDER BY _enddate.field_value DESC LIMIT 100;

示例3:

select a.* from
(select * from `entities_instance` test WHERE test.`entity_id` = 67) as a
INNER JOIN `instance_fields_data` artists 
 ON ( a.entity_instance_id = artists.entity_instance_id 
      AND artists.`dynamic_field_name` = 'artists' 
      AND artists.`field_value` like '%8605:%')
 INNER JOIN `instance_fields_data` _enddate 
 ON (a.entity_instance_id = _enddate.entity_instance_id) 
    AND (_enddate.`dynamic_field_name` = 'enddate') 
GROUP BY a.entity_instance_id
ORDER BY _enddate.field_value DESC 
LIMIT 100;

最后，在进一步优化中，我们使用

EXISTS

进一步过滤

实例字段\数据的两个子查询的结果。我相信这可以进一步简化/优化。还要确保您的键上有索引（例如实体\u实例\u id），否则这会更慢

SELECT a.*
FROM
  (SELECT *
   FROM `entities_instance` test
   WHERE test.`entity_id` = 67) AS a,

  (SELECT *
   FROM `instance_fields_data` test2
   WHERE test2.`dynamic_field_name` = 'artists'
     AND test2.`field_value` LIKE '%8605:%'
     AND EXISTS
       (SELECT *
        FROM `entities_instance` z
        WHERE z.entity_instance_id = test2.entity_instance_id AND
        z.`entity_id` = 67)) AS artists,

  (SELECT *
   FROM `instance_fields_data` test3
   WHERE test3.`dynamic_field_name` = 'enddate'
     AND EXISTS
       (SELECT *
        FROM `entities_instance` z
        WHERE z.entity_instance_id = test3.entity_instance_id AND
        z.`entity_id` = 67)) AS _enddate
WHERE a.entity_instance_id = artists.entity_instance_id
  AND a.entity_instance_id = _enddate.entity_instance_id
GROUP BY a.entity_instance_id
ORDER BY _enddate.field_value DESC LIMIT 100;

我会构造一个伪标准化的物化视图，然后处理它-你知道
选择一个*MAX（CASE…WHEN…then…END）艺术家。等。
应用group by通常需要对查询中的列进行一些聚合，如min（）、max（）、avg（）等。。。。但是，在两个相应的表上有什么索引。。。你有WHERE和JOIN，但看起来没问题。在
实例字段数据中的
实体实例id、动态字段名称
上的复合索引可能会有所帮助。如果你给我们提供表结构和示例数据，我们可以帮到更多。。。