Question

我有这样的桌子：

+-----------+--------------------------------------+--------------+
| DesignKey |            DesignTypeGuid            | DesignNumber |
+-----------+--------------------------------------+--------------+
|      2312 | 4FB560B0-E867-46B2-B116-338AD48C97AC |            3 |
|      2313 | 4FB560B0-E867-46B2-B116-338AD48C97AC |            7 |
|      2314 | 4FB560B0-E867-46B2-B116-338AD48C97AC |            8 |
+-----------+--------------------------------------+--------------+

所以我通过查询获得DesignNumber值：

DECLARE @CurrentChangeOrderDesignNumber INT = 
              (SELECT [DesignKey], [DesignNumber] 
                FROM [Design] 
                WHERE ParentDesignKey = @DesignKey
                AND DesignTypeGuid = @COTypeGuid ORDER BY DesignKey);

我要做的是获取此数据并设置从1开始的新DesignNumber值，所以我的期望结果应该是：

+-----------+--------------------------------------+--------------+
| DesignKey |            DesignTypeGuid            | DesignNumber |
+-----------+--------------------------------------+--------------+
|      2312 | 4FB560B0-E867-46B2-B116-338AD48C97AC |            1 |
|      2313 | 4FB560B0-E867-46B2-B116-338AD48C97AC |            2 |
|      2314 | 4FB560B0-E867-46B2-B116-338AD48C97AC |            3 |
+-----------+--------------------------------------+--------------+

我该如何实现？问候

Answer 1

在SELECT查询中，您将使用ROW_NUMBER()：

SELECT [DesignKey], [DesignNumber],
       ROW_NUMBER() OVER (PARTITION BY ParentDesignKey, DesignTypeGuid ORDER BY DesignNumber) as new_DesignNumber 
FROM [Design] 
WHERE ParentDesignKey = @DesignKey AND
      DesignTypeGuid = @COTypeGuid
ORDER BY DesignKey;

如果要更新值，可以使用可更新的CTE：

WITH toupdate as (
      SELECT d.*,
             ROW_NUMBER() OVER (PARTITION BY ParentDesignKey, DesignTypeGuid ORDER BY DesignNumber) as new_DesignNumber 
      FROM Design d
      WHERE ParentDesignKey = @DesignKey AND
            DesignTypeGuid = @COTypeGuid
     )
UPDATE toupdate
    SET DesignNumber = new_DesignNumber;

将连续数字设置为特定行

1 个答案: