Mysql，如何避免同一个表上的多个连接

Question

Is there a way (using some mysql programming) to avoid multiple joins on the same table with different alias? For example I have

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  

The Join with custom_field_string table is done 3 times, because it has different attributes. How can I do this just with 1 join but mantaining the different attributes. I have the problem of reaching the 61 joins limit.

Answer 1

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 in (60, 321, 322);

If only three rows matched, you'd get 3 results here instead of 1 row with 3 columns.