更新＆＃34;订单＆＃34;删除一行后的列？

Question

我有一个ProductsImages表，其中包含ImageId, Productid ,Order：

ProductId   ImageId    Order
----------------------------
    1          1        1
    1          2        2
    1          3        3
    1          4        4
    1          5        5

当我删除一行时，请说ProductId = 1 ImageId = 1我需要更新订单栏：

ProductId   ImageId    Order
----------------------------
    1          2        1
    1          3        2
    1          4        3
    1          5        4

Answer 1

执行delete后，您可以进行更新：

with toupdate as (
      select pi.*,
             row_number() over (partition by productId order by [order]) as neworder
      from ProductImages pi
     )
update toupdate
    set [order] = neworder;

以上更新了整个表格。如果您只想更新已更改的产品，请添加where子句：

with toupdate as (
      select pi.*,
             row_number() over (partition by productId order by [order]) as neworder
      from ProductImages pi
      where pi.ProductID = @ProductId
     )
update toupdate
    set [order] = neworder;