Question

我将这个用[TankNumId]创建的表作为计算列。

如何将数据类型强制为int。它保持设置为nvarchar，这是列[TankNum]的数据类型。

[TankNum]列中的值为100-1, 100-2 100-3, etc。因此，为什么我使用计算列来转换＆＃39; - ＆＃39;到＆＃39;。＆＃39;这样它就可以成为[TankNumId]列中的有效int。有什么建议？

CREATE TABLE [dbo].[tblTank9](
[Id] [int] IDENTITY(1,1) NOT NULL,
[TankNumId]  AS (replace([TankNum],'-','.' )) PERSISTED NOT NULL,
[TankNum] [nvarchar](10) NULL,
[CompanyName] [nvarchar](30) NULL,
[Ft] [float] NULL,
[Inch] [float] NULL,
[HFt] [smallint] NULL,
[HIn] [smallint] NULL,
[HFx] [smallint] NULL,
[GaPt] [char](100) NULL,
 CONSTRAINT [PK_tblTank9] PRIMARY KEY CLUSTERED 
(
[TankNumId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

Answer 1

replace 函数接收nvarchar并返回nvarchar

您需要CAST或CONVERT您的结果才能浮动，因为100.1不是整数

SELECT CAST(YourVarcharCol AS float) FROM Table
SELECT CONVERT(float, YourVarcharCol) FROM Table

将计算列强制为int

1 个答案: