Symptoms
Assume that you have an instance of Microsoft SQL Server 2012 that has SQL Server 2012 Service Pack 1 (SP1) cumulative update 7 or a later version update installed. You execute the system stored procedure sp_describe_undeclared_parameters, and the stored procedure includes an always FALSE statement in the statement for @tsql parameter. For example:
sp_describe_undeclared_parameters @tsql= N'SELECT * from testTable where column1 = @p1 AND 1=2'In this situation, the execution of sp_describe_undeclared_parameters fails, and you receive the following error message:
Msg 11502, Level 16, State 2, Line 28
The type for parameter '@p1' cannot be deduced in this context.
Note This issue also occurs in SQL Server 2014.
Resolution
Cumulative Update information
The issue was first fixed in the following cumulative update of SQL Server.
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. We recommend that you download and install the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
