Max two same value in one field

Hi,
I have a project in hand. I can't figure out how to deal with
it. I am not
very good at manual script. I can handle on my own, though.
My problem is I need check in the insert page if a certain
value is in that
field two time. If so, I do not want the visitor to insert,
and system to
warn the visitor to insert another value for the selected
field.
For example, below, for the file code, if the
visitor/operator inserts 314,
it should give error because there are two records whose
file_code field
containing 314.
file_id filename file_code
1 dummyname 225
2 dummyname 314
3 dummyname 225
4 dummyname 314
5 dummyname 532
6 dummyname 756
7 dummyname 225
8 dummyname 987
Thank you indeed
Hakan

OK, just noticed that you want to allow two of the same
value, but no more than two.
In that case, before inserting , just perform a select count
using the attempted insert value in the where clause. If less than
2 allow the insert, otherwise display the error.

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