First you would need a means of identifying your oldest entry, some kind
of Date-Time field would seem simplest. Then, one way, would be to
SELECT the oldest value and use it in the 'where' clause of an UPDATE.
SELECT MIN(stamp) FROM table;
will get the oldest date-time value
UPDATE table SET stamp = '$NewStamp', col2 = $col2 WHERE stamp = '$Oldest;;
would update the entry.
Apologies for the sparse code snippets, but I'm in a hurry and don't
have time to write the full PHP for the queries.
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