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SQLite does not care about types and VARCHAR and NVARCHAR mean just the same for it http://stackoverflow.com/questions/3930501/difference-between-varchar-nvarchar-in-sqlite. The real problem is in the GDAL MapInfo driver that does not handle character encodings. There are some workarounds: Convert MapInfo data into MID/MIF format with ogr2ogr and convert ...


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I do not believe that the AddGeometryColumn part is possible at all. This thread tells that it is not possible to use it for attached databases https://groups.google.com/forum/#!topic/spatialite-users/rRMSHk2Lt38 and the temporary database is an attached, automatically created database. You must create your temporary tables into the main database and drop ...



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