8 ms·

Note that you shall never assume that the birth numbers or SSNs are unique: they are often NOT. I've heard that they are not unique in the US and a few stories

Note that you shall never assume that the birth numbers or SSNs are unique: they are often NOT. I've heard that they are not unique in the US and a few stories from my Databases course professor about how you should always assign your own unique IDs to users. Birth numbers change.

kwhitefoot 8y ago
> never assume that the birth numbers or SSNs That's a parochial view, US SSNs are not unique but Norwegian SSNs (fødselsnummer) are unique. In Norway it is composed of a six digit birthdate plus a five digit code (personnummer).
- eesmith 8y ago
  They may be unique, but do they change? Google translates the Norwegian Wikipedia entry as saying "The last digit in the individual number indicates the gender of the person - different digits for men and equal numbers for women." Does this change for transgender people, or for those who undergo sex reassignment surgery? I wasn't able to find information about this for Norwegian. The equivalent entry for Sweden, at https://en.wikipedia.org/wiki/Personal_identity_number_(Sweden) https://en.wikipedia.org/wiki/Personal_identity_number_(Swed... , says : > In exceptional cases, the number may be changed later in life, typically because the date of birth or the registration of gender of the child were in error. If a person undergoes full gender reassignment surgery later in life, the serial number is changed to make the 'gender digit' (no. 9) conform with their new physical sex.