1-how to back up from data in a table that are inserted between a part of time ? 2- how to restore this data but no over write under old data
there are may ways of "backing up" data in a table
To restore, it depends on how you backup the data basically to restore without overwrite, you will need to "restore" the "backup" to another table or database
What are you looking for more specifically ?
CHeck out this link and see if this data structure will meet your needs.
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