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There are ? in my data columns and I have to replace them with NULL. In my SSIS package.

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if a question mark is in the column already it must be some kind of string.

Use a derived column and a if function:

[colName] == "?" ? NULL(DT_STR, «length», 1252) : [colName]

or

[colName] == "?" ? NULL(DT_WSTR, «length») : [colName]
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