sql server - Custom query converts dt_wstr in nchar sql type -


i create in ssis custom query:

select top 1 *  (select * [dbo].[tyrepoints]) [reftable] ([reftable].[brand] ? or [reftable].[brand] = '*')  order [reftable].[priority] desc

the "?" replaced dt_wstr(20) variable , [reftable].[brand] nvarchar(20) field in db.

when check result of query sql profiler :

exec sp_executesql n'select top 1 *  (select * [dbo].[tyrepoints]) [reftable] ([reftable].[brand] @p1 or [reftable].[brand] = ''*'') order [reftable].[priority] desc',n'@p1 nchar(20)',n'test                '

why ssis converts dt_wstr type in nchar?

how can have result nvarchar type?


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