In Delphi i use an odbc gateway to an excel spreadsheet. The problem with the odbc gateway is that it scans a number of rows to determine the data type of each column... The data type is determined given the maximum number of kinds of data found. If data is encountered that does not match the data type guessed for the column, the data type will be returned as a NULL value.
I have xls files with different types on different rows.
What to do.
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