忘记将主键列添加为Identity

Question

我创建了一个像这样的表

    CREATE TABLE [dbo].[sydShopOrder](
    [rowNumber] [varchar](50) NULL,
    [firstName] [varchar](50) NULL,
    [lastName] [varchar](50) NULL,
    [employeeNumber] [varchar](50) NULL,
    [productID] [varchar](50) NULL,
    [shopID] [varchar](50) NULL,
    [location] [varchar](50) NULL,
    [address] [varchar](50) NULL,
    [department] [varchar](50) NULL,
    [datestamp] [date] NULL
) ON [PRIMARY]

我打算将[rowNumber]作为主键，并将其设为identity列，并自动增加。但我忘了这么做。现在，数据库已在实时环境中启动并运行。我很晚才发现这个bug。有什么办法可以解决这个问题吗？将[rowNumber]列设为标识并自动递增？

表的当前屏幕截图如下所示

Answer 1

您可以删除[rownumber]，然后添加身份

Alter Table [dbo].[sydShopOrder] Drop Column rownumber
Go
Alter Table [dbo].[sydShopOrder]
Add rownumber Int Identity(1, 1)
Go

如果要填充现有数据的标识字段，最好创建另一个临时表，并保留[dbo].[sydShopOrder]的所有记录。在truncate [dbo].[sydShopOrder]之后，然后将该临时表中的值插入[dbo].[sydShopOrder]

CREATE TABLE #temp  ([firstName] [varchar](50) NULL,
    [lastName] [varchar](50) NULL,
    [employeeNumber] [varchar](50) NULL,
    [productID] [varchar](50) NULL,
    [shopID] [varchar](50) NULL,
    [location] [varchar](50) NULL,
    [address] [varchar](50) NULL,
    [department] [varchar](50) NULL,
    [datestamp] [date] NULL)

INSERT INTO #temp 
SELECT [firstName],[lastName],[employeeNumber],
       [productID], [shopID],[location],
       [address],[department],[datestamp]
FROM [dbo].[sydShopOrder]

TRUNCATE TABLE [dbo].[sydShopOrder]

INSERT INTO [dbo].[sydShopOrder]
SELECT * FROM #temp

以下是SQLFIDDLE

示例