Is there a way to revert a table to the same form as it was when I imported it from sql database file after I have modified it previously?
Revert all changes made in tables
Yes, it's called "backup".
As soon as the database is updated you've literally overwritten old data. In some situations (depending on what you're doing) a typical Ctrl-Z may work for the last step, however if you alter the table structure and then decide to post the update your old state is lost. Except you have a backup, of course.
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