pilih satu nilai jika ada, yang lain jika tidak

Salah satu pendekatan adalah dengan meninggalkan join dua kali ke catalog_product_entity_text. Sekali untuk ID 0 dan satu lagi untuk ID 3 lalu lakukan COALESCE di pilih

SELECT
..
 COALESCE(`short_description_id`.`value` , `short_description_id_DEFAULT`.`value`) AS `short_description`
..
FROM 
...

     LEFT JOIN `catalog_product_entity_text` AS `short_description_id` 
     ON p2c.product_id = short_description_id.entity_id 
         AND short_description_id.attribute_id = 62
         AND (short_description_id.store_id = 3)

     LEFT JOIN `catalog_product_entity_text` AS `short_description_id_DEFAULT` 
     ON p2c.product_id = short_description_id.entity_id 
         AND short_description_id.attribute_id = 62
         AND (short_description_id.store_id = 0)