Oracle Database Express Edition (XE)

when i upload a *.cvs file into oracle express using the data upload tool the column mapping changes. i have uploaded the same data before, to test things out, i have deleted all the data in the table and now want to load in fresh data for further testing and the mapping looks good in the *.cvs file before i upload but when i get to the last step the columns have changed position in the *.cvs file.

any idea why that may happen? and what can i do to prevent it from happening.

thank you in advance.