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Tips:Forcing all Character Variables when Importing a CSV File
When using PROC IMPORT to read CSV files, the SCANTYPE=MIXED option is not available. This means that we do not have an option to force variables to be character. The GUESSINGROWS option can be used, but it can be costly for large files, or potentially not sufficient. Although it does require two passes of the data, there is a way to force all columns to be character when using PROC IMPORT on a CSV file.