声明变量时出现 T-SQL 错误

Question

Declare @ID nvarchar(14) = '12345678912345'  
DECLARE @Key int = (SELECT  key
                           FROM    table
                           WHERE   id = @ID) 

Declare @indicator varchar(1) = 'A' 

Declare @rdate Datetime = (SELECT LTRIM(RTRIM(Left(CAST(GetDate() AS Datetime2),23))))


SELECT @ID 
GO
SELECT @Key 
GO
SELECT @indicator 
GO
SELECT @date 
GO

执行上述代码时出现错误。我看到@ID 打印，它消失了，我收到以下消息。

"必须声明标量变量"@Key"

"必须声明标量变量"@indicator"

"必须声明标量变量"@date"

表中的数据类型：ID = nvarchar(14)、key = int、indicator = varchar(1) 和 date = timestamp

Answer 1

Go 将结束作用域并销毁变量。

改用;

SELECT @ID;SELECT @Key;SELECT @indicator;SELECT @rdate;