Data loading wizard supports MAX 45 columns.
See the APEX_DATA_PARSER
package which lets you parse CSV files with up to 300 columns. However, you'd still have to code INSERT
by yourself; Apex can't/won't do it for you.
Another alternative (out of Apex, though) is to use SQL*Loader or its sub-alternative - an external table. There's no wizard for any of those options, so yes - you'll have to do some typing yourself.
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