Question

我有很多需要删除的重复产品。是否有一个查询删除这些“重复”与“较低价格”和/或“相同价格”只是保持每个产品1？

重复项有重复的“产品名称”我正在使用Opencart版本2.1.0.1

Answer 1

由于您使用的是mysql，因此需要使用连接（不支持分区）：

选择：

select p.* 
from products as p 
join 
(
    select name, min(price) as price 
    from products group by name having count(price) = 2
) as p2 on p2.name = p.name and p2.price = p.price;

获取所有重复产品的最低价格（其中重复数据假定同一产品恰好有两行）。

要删除，请将初始选择更改为删除，如下所示：

delete p.* 
from products as p 
join 
(
    select name, min(price) as price 
    from products group by name having count(price) = 2
) as p2 on p2.name = p.name and p2.price = p.price;

Answer 2

没有太多信息（哪个RDBMS等）我只能推测这个解决方案对你有用：

WITH Flagged AS
(
SELECT
    ProductName,
    CASE WHEN ROW_NUMBER() OVER(PARTITION BY ProductName ORDER BY Price DESC) = 1 THEN 0 ELSE 1 END AS Delete
FROM
    Products
)

DELETE p
FROM Products p
JOIN Flagged f
ON (p.ProductName = f.ProductName)
WHERE f.Delete = 1;

Answer 3

根据http://wiki.opencarthelp.com/doku.php?id=databse_schema上的架构，只有一种语言，下面的查询应解决您的问题：

delete p1 
from product p1
join product_description d1 on d1.product_id = p1.product_id
join product_description d2 
  on  d2.product_id <> d1.product_id
  and d2.language_id = d1.language_id
  and d2.name = d1.name
join product p2 on p2.product_id = d2.product_id
where d1.language_id = 1 -- define the language used for product name
  and (p2.price > p1.price -- delete if higher price exists
    or p2.price = p1.price and p2.product_id < p1.product_id -- delete if same price with lower id exists
  )
;

使用mysql查询以较低的价格删除重复的产品

3 个答案: