unique-recordrule
nounUK /juːˈniːk ˈrekɔːd ruːl/
US /juˈnik ˈrɛkərd rul/
A rule that says each record in a list must be different from all the others.
The database uses a unique-recordrule so no two students can have the same ID number.
OTHER MEANINGS
2. A guideline ensuring every entry in a collection appears only once.
The contest's unique-recordrule meant each person could submit only one entry.
3. A condition that rejects any repeated value in a specified field.
Adding a unique-recordrule to the email column stopped people from signing up twice.
4. A design principle that keeps each stored item individually identifiable.
Thanks to the unique-recordrule, the library catalog never lists the same book twice.