Data storage systems usually assign unique identifiers to the entries they store. For example, (relational) database tables typically include an `Id` column:
Data storage systems usually assign unique identifiers to the entries they store. For example, (relational) database tables typically include an `Id` column:
| Id | Name | BankAccountNr | LastDoctorVisit | ... |
| Id | Name | BankAccountNr | LastDoctorVisit | ... |