mysql - 比较sql中的两个值

Question

我有一个带有双图像的 magento 数据库，我想删除它们，但首先我必须使用 sql 查询来检测它们。

我试过这段代码

select t1.VALUE from catalog_product_entity_media_gallery t1 
join catalog_product_entity_media_gallery t2 on (t1.value = t2.value)

这个:

  select * from catalog_product_entity_media_gallery where value=value 

还有这个:

select
*
from
(
    select
        value
    from
        catalog_product_entity_media_gallery
    group by
        value
    having count(*) > 1
) as t
inner join catalog_product_entity_media_gallery on (
    catalog_product_entity_media_gallery.value = t.value
)

第一个给出错误，第二个和第三个返回所有产品。

Answer 1

试一试:

select
*
from (
    select 
        entity_id,attribute_id,value,
        MIN(value_id) value_id
    from catalog_product_entity_media_gallery
    group by
        entity_id,attribute_id,value
    having COUNT(*) > 1
) A1
inner join catalog_product_entity_media_gallery A2 on
    A1.entity_id = A2.entity_id and
    A1.attribute_id = A2.attribute_id and
    A1.value = A2.value and
    A1.value_id = A2.value_id