Question

In my sqluery, i am trying to add columns dynamically, but it is showing error Like:
Msg 214, Level 16, State 2, Procedure sp_executesql, Line 1
Procedure expects parameter ‘@statement’ of type ‘ntext/nchar/nvarchar’.
this is my proc

        declare @curntyear int
           declare @pasyear int
           declare @sql nvarchar(max)
           declare @temp varchar(50)                
            select  @pasyear=YEAR( DATEADD (YEAR,-3,GETDATE ()))
            select @curntyear =YEAR (getdate())
            print @pasyear
            print @curntyear               
             create table #TempTable (years varchar(30))
             insert into #TempTable  select (cargo+port+railway+estate)as 'sum' from operatingincome where YEAR(createddate)=@pasyear                   
           while (@curntyear >=@pasyear )
            begin
               set @pasyear =@pasyear +1
               --select @temp=(cargo+port+railway+estate)as 'sum' from operatingincome where YEAR(createddate)=@pasyear 
               select  @temp= convert(varchar,(cargo+port+railway+estate),106)   from operatingincome where YEAR(createddate)= @pasyear
               set @sql ='alter table #TempTable add '+ CONVERT(varchar,@pasyear,106)+' varchar(50)'        

                  exec sp_executesql @sql 
                   print @sql
                                           set @sql = 'update #TempTable set '+CONVERT(varchar,@pasyear,106) +'='+@temp +' where years='''+CONVERT(varchar,@pasyear,106)+''
                      exec sp_executesql @sql 
               set @temp =''
              end
              select * from #TempTable     

i am getting error like this :

Msg 102, Level 15, State 1, Line 1
Incorrect syntax near ‘2009’.
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near ‘2010’.
alter table #TempTable add 2010 varchar(50)
update #TempTable set 2010=9300 where years=2010

Answer 1

Sounds like you’re calling sp_executesql with a VARCHAR statement, when it needs to be NVARCHAR.

e.g. This will give the error because @SQL needs to be NVARCHAR

Declare your variable @sql varchar to nvarchar, that will work fine:

declare @sql nvarchar(max)

UPdate:

Change your sql setting as below: you need to use [] in column name as [ColumName]

set @sql ='alter table #TempTable add ['+ CONVERT(varchar,@pasyear,106)+'] varchar(50)'

set @sql = 'update #TempTable set ['+CONVERT(varchar,@pasyear,106) +']='+@temp +' where years='''+CONVERT(varchar,@pasyear,106)+''