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using table name variable in create function

Posted By:      Posted Date: September 30, 2010    Points: 0   Category :Sql Server

anybody help me, i wanna create function using table name parameter.

this is my function code

ALTER function [dbo].[CreateRecID]( @TableName varchar(100))
returns bigInt
declare @RecID bigint
declare @Sql varchar(2000)
set @Sql = (select case when max(RecID) is null then 0 else max(RecID) + 1 end as RecID from @TableName)

return @Sql

when i run this code

i got error "Must declare the table variable "@TableName".

I have already declare a @TableName Parameter.

can you show me the way to solve my problem?

Thanks so much

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