如何最小化这个mysql查询

Question

我按照ID选择照片，然后按照订单字段选择下一张照片。

我检查照片id = 33的存在并按顺序查找下一张照片

SELECT `id` FROM `product_photo` 
WHERE 
`product_id` = (SELECT `product_id` FROM `product_photo` WHERE `id` = '33' ) 
AND 
`order` >= (SELECT `order` FROM `product_photo` WHERE `id` = '33' ) 
LIMIT 2

是否可以简化此查询？

Answer 1

有没有听说过JOINing tables？

SELECT photo.id
FROM product_photo
INNER JOIN product_photo AS photo ON photo.product_id = product_photo.product_id
   AND photo.order >= product_photo.order
WHERE product_photo.id = '33';

FROM和WHERE部分将选择您的产品id = 33然后您加入product_photo使用不同的别名（是的，您可以多次加入同一个表格）查询）基于product_id和order。