problem php mysql

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hello  i create a table with mysql with an identifier autoincrement.
and via a form I manage to store my data in the table. my problem is
that if I remake the same data they are stored  second once with a new
identifier. or as I click on precedent of the navigator and I revalide
the data they will pass under another identifier. I want that the data
are inserted only once in the table thank you

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