Sql 如何按一组递增列

我有一个名为

productLocation

的表，其数据结构如下：

对于每个位置，都有自己的产品排序顺序。但有些产品将

0

作为

排序值

现在我需要编写一个查询来更新

SortValue

as

如果我考虑一个位置，<代码> fkLoosithId＝1 < /代码>

+--------------+-------------+-----------+
| FkLocationId | FkProductId | SortValue |
+--------------+-------------+-----------+
| 1            | 100         | 0         |
+--------------+-------------+-----------+
| 1            | 101         | 0         |
+--------------+-------------+-----------+
| 1            | 102         | 0         |
+--------------+-------------+-----------+
| 1            | 103         | 2         |
+--------------+-------------+-----------+
| 1            | 104         | 1         |
+--------------+-------------+-----------+
| 1            | 105         | 3         |
+--------------+-------------+-----------+

在上面的数据表中，您可以看到，

FkProductId=100101102

具有

0

作为

排序值。我需要按降序将其
sortValue
更新为order by
FkProductId
。我需要更新它的内容

+--------------+-------------+-----------+
| FkLocationId | FkProductId | SortValue |
+--------------+-------------+-----------+
| 1            | 100         | 3         |
+--------------+-------------+-----------+
| 1            | 101         | 2         |
+--------------+-------------+-----------+
| 1            | 102         | 1         |
+--------------+-------------+-----------+

并逐个更新以前的SortValue

那么完整的输出应该是

+--------------+-------------+-----------+
| FkLocationId | FkProductId | SortValue |
+--------------+-------------+-----------+
| 1            | 100         | 3         |
+--------------+-------------+-----------+
| 1            | 101         | 2         |
+--------------+-------------+-----------+
| 1            | 102         | 1         |
+--------------+-------------+-----------+
| 1            | 103         | 5         |
+--------------+-------------+-----------+
| 1            | 104         | 4         |
+--------------+-------------+-----------+
| 1            | 105         | 6         |
+--------------+-------------+-----------+

这可能吗？我真的很困惑，请帮我解决这个问题。多谢各位

更新：

假设我有另一张桌子作为产品。其数据结构如下：

+-----------+-----------+
| ProdcutId | SortValue |
+-----------+-----------+
| 100       | 0         |
+-----------+-----------+
| 101       | 0         |
+-----------+-----------+
| 107       | 0         |
+-----------+-----------+
| 108       | 1         |
+-----------+-----------+
| 109       | 2         |
+-----------+-----------+
| 110       | 6         |
+-----------+-----------+
| 111       | 5         |
+-----------+-----------+
| 112       | 4         |
+-----------+-----------+
| 113       | 3         |
+-----------+-----------+

我也需要为这张桌子做同样的事情，我该怎么做呢

预期产出：

+-----------+-----------+
| ProdcutId | SortValue |
+-----------+-----------+
| 100       | 3         |
+-----------+-----------+
| 101       | 2         |
+-----------+-----------+
| 107       | 1         |
+-----------+-----------+
| 108       | 4         |
+-----------+-----------+
| 109       | 5         |
+-----------+-----------+
| 110       | 9         |
+-----------+-----------+
| 111       | 8         |
+-----------+-----------+
| 112       | 7         |
+-----------+-----------+
| 113       | 6         |
+-----------+-----------+

下面是一个示例查询，供您使用CTE检查更新过程并使用相同的逻辑-


重要提示：更新是一个危险的过程，您应该首先尝试使用测试数据

WITH CTE
AS
(
    SELECT *,
    (
        SELECT COUNT(*) 
        FROM #Temp B 
        WHERE B.FkLocationId = A.FkLocationId
        AND SortValue = 0
    ) Zero_Count,
    -- The above Zero count is a simple count of rows with 0
    -- for a specific FkLocationId. This is for adding to other 
    -- rows where there are already value in column SortValue. The logic
    -- is simple, the number of row with 0 in column SortValue, 
    -- should be add to existing value where there is value not equal 0.
    ROW_NUMBER() OVER (PARTITION BY FkLocationId ORDER BY SortValue ASC, FkProductId DESC) RN
    -- ROW_NUMBER is simply creating the Number you should replace 0 by.
    -- As you are looking for 1 to start for the MAX FkProductId with 0,
    -- I applied DESC order on that column
    FROM #Temp A
) 

UPDATE A
SET A.SortValue = 
CASE 
    WHEN A.SortValue = 0 THEN B.RN 
    -- RN is created in such way, so that you can directly 
    -- Replace your value in column SortValue by RN if SortValue = 0 
    ELSE A.SortValue + B.Zero_Count
    -- IF SortValue contains already value > 0, 
    -- You need to just increment the value with Number 
    -- of rows is there with value 0. I have calculated that value
    -- by a sub query in the CTE you can check.
END
FROM  #Temp A
INNER JOIN CTE B ON A.FkLocationId = B.FkLocationId
AND A.FkProductId = B.FkProductId


SELECT * FROM #Temp

只要用我用过的“表名”就行了

我所采用的方法的核心是基于行数窗口函数，它将数据按sortvalue和fkproductid降序地划分到fkproductid上

涉及到两个查询，虽然可以通过单个查询完成，但为了简单起见，我使用了公共表表达式（CommonTableExpression，cte）

在第二次更新查询中，从查询一派生的CTE用作联接表

我给自己留下了很多探索的余地，请记住，从集合的角度思考是非常必要的
 有一个漂亮的小按钮叫做“文本到DDL”。请使用它，并将您的问题与示例数据一起使用。请向我们展示您的尝试，以便我们能够提供帮助。@ZoharPeled我使用SQL fiddle sir更新了问题@Adam如果确实有用，请接受答案：）如果您能解释查询中的每个部分，会更好。@Adam，我在脚本中添加了一些注释。检查是否有帮助。如果需要进一步澄清，我可以解释。主席先生，我在我的问题中添加了另一个更新的部分。请你解释一下，我如何对该表做同样的事情。所以我很容易接受一个想法。请给我一个更新部分的答案，你也可以使用相同的查询。唯一的区别是这次没有FkLocationId列。只需避免查询中使用FkLocationId列作为ref的部分。
WITH CTE
AS
(
    SELECT *,
    (
        SELECT COUNT(*) 
        FROM #Temp B 
        WHERE B.FkLocationId = A.FkLocationId
        AND SortValue = 0
    ) Zero_Count,
    -- The above Zero count is a simple count of rows with 0
    -- for a specific FkLocationId. This is for adding to other 
    -- rows where there are already value in column SortValue. The logic
    -- is simple, the number of row with 0 in column SortValue, 
    -- should be add to existing value where there is value not equal 0.
    ROW_NUMBER() OVER (PARTITION BY FkLocationId ORDER BY SortValue ASC, FkProductId DESC) RN
    -- ROW_NUMBER is simply creating the Number you should replace 0 by.
    -- As you are looking for 1 to start for the MAX FkProductId with 0,
    -- I applied DESC order on that column
    FROM #Temp A
) 

UPDATE A
SET A.SortValue = 
CASE 
    WHEN A.SortValue = 0 THEN B.RN 
    -- RN is created in such way, so that you can directly 
    -- Replace your value in column SortValue by RN if SortValue = 0 
    ELSE A.SortValue + B.Zero_Count
    -- IF SortValue contains already value > 0, 
    -- You need to just increment the value with Number 
    -- of rows is there with value 0. I have calculated that value
    -- by a sub query in the CTE you can check.
END
FROM  #Temp A
INNER JOIN CTE B ON A.FkLocationId = B.FkLocationId
AND A.FkProductId = B.FkProductId


SELECT * FROM #Temp

with cte as
(select FkLocationId, FkProductId, SortValue,
ROW_NUMBER() over(partition by FkLocationId order by sortvalue,FkProductId desc) new_sort_value
from productLocation where FkLocationId =1  --and SortValue =0
)

update pl SET
pl.SortValue = c.new_sort_value
from productLocation pl inner join cte c
on pl.FkLocationId = c.FkLocationId and pl.FkProductId = c.FkProductId

Select * from productLocation where FkLocationId =1 order by FkProductId