sql server - how to pass table name as a parameter in UD scaller function? -

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create function test (   @tblname  sysname,   @category varchar(50) ) returns int begin    declare @val2 int   select @val2=val1 @tblname val1=@tblname    return @val2 end

whats wrong query, it's throwing following error

msg 1087, level 15, state 2, procedure test, line 11
must declare table variable "@tblname".

you can't parameterise table name. need use dynamic sql (not allowed in functions anyway).

you might able use view or cte union alls fixed list of tables , constant whatever trying do. code have posted makes little sense (you want @val2 have same value @tblname if table called value of @tblname contains same value in val1 column?!) like

;with cte ( select 'table1' table_name, val1 table1 union select 'table2' table_name, val1 table2 ) select @val2=val1 cte table_name=@tblname , val1 = @tblname

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