操作数类型冲突

问题描述

我有一个很长的存储过程，当我执行该过程时出现以下错误:

I have a long stored procedure and when I execute the procedure I get the following error:

Msg 206, Level 16, State 2, Line 1
Operand type clash: varchar(max) is incompatible with sql_variant

所以为了解决问题，我已经打印了问题所在，代码是:

So to trouble shoot I have printed satetement where the problem is and the code is:

SELECT  'Name' ,
                7 ,
                CASE WHEN 'varchar' = 'varbinary'
                     THEN REPLACE(UPPER(sys.fn_sqlvarbasetostr([Name])), 'X', 'x')
                     ELSE CONVERT(VARCHAR(4000), [Name])
                END , 'varchar'
        FROM    ref.dbo.datatables
        WHERE   id = 12
        ORDER BY [ID]

所以当我执行上面的语句时，它给我的错误是:

So When I execute the above statement it is givng me the error as:

Msg 206, Level 16, State 2, Line 1
Operand type clash: varchar(max) is incompatible with sql_variant

在ref.dbo.datatables表中Name的数据类型是Varchar(MAX)

The datatype of Name is Varchar(MAX) in ref.dbo.datatables table

如何解决这个问题?

答案:

这就是我所做的工作:

SELECT 'Name',
        7,
        CASE WHEN 'varchar' = 'varbinary'
        THEN REPLACE(UPPER(sys.fn_sqlvarbasetostr(CONVERT(VARBINARY,[Name]))),'X','x')
        ELSE CONVERT(VARCHAR(4000),[Name])
        END,
        'varchar'
FROM ref.dbo.datatables
WHERE id = 12
ORDER BY [ID]

推荐答案

错误是正确的，您不能隐式(或显式)将 VARCHAR(MAX) 强制转换为 sql_variant.如果 Name 是 VARCHAR(MAX)，您需要将其转换为兼容类型(如 VARCHAR(8000) 以传递它作为 sys.fn_sqlvarbasetostr()