Mysql，如何避免同一个表上的多个连接

Question

有没有办法（使用一些mysql编程）避免在具有不同别名的同一个表上进行多个连接？例如，我有

SELECT *
FROM `container` AS `cont_link`  
LEFT JOIN `custom_field_string` AS `sf0` ON cont_link.id = sf0.container_id AND sf0.custom_field_id=60 
LEFT JOIN `custom_field_string` AS `sf3` ON cont_link.id = sf3.container_id AND sf3.custom_field_id=321 
LEFT JOIN `custom_field_string` AS `sf4` ON cont_link.id = sf4.container_id AND sf4.custom_field_id=322
LEFT JOIN `custom_field_int` AS `sf1` ON cont_link.id = sf1.container_id AND sf1.custom_field_id=319 
LEFT JOIN `custom_field_int` AS `sf2` ON cont_link.id = sf2.container_id AND sf2.custom_field_id=320  

使用custom_field_string表连接3次，因为它具有不同的属性。我怎么能只用1个连接但保留不同的属性来做到这一点。 我有达到61连接限制的问题。

Answer 1

SELECT * 来自container AS cont_link
LEFT JOIN custom_field_string AS sf0 ON cont_link.id = sf0.container_id AND sf0.custom_field_id in（60,321,322）;

如果只有三行匹配，则此处将获得3个结果，而不是包含3列的1行。