SSIS Lookup by NVarChar(Max) Column

Question

I want to get id from target table by lookup with NVarChar(Max) column in target table and NVarChar(20) column in source table. But raise error Cannot map the lookup colum

Answer 1

In your Lookup transformation, you need to cast the blob (nvarchar(max)) to a non-blob type. In this case, I would assume you need to cast it to nvarchar(20).

You will need to write a query in the lookup transformation and not just select the table.

Assuming the lookup table looks like

LookupTable
--------------
Column0 int
Column1 nvarchar(max)
Column2 nvarchar(500)

You query would look like

SELECT 
    L.Column0
,   CAST(L.Column1 AS nvarchar(20)) AS Column1
,   L.Column2 
FROM
    dbo.LookupTable L

You should now be able to perform a lookup on that column.