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I'm a tech interested guy. I've touched SQL once or twice, but wasn't able to really make sense of it. That combined with not having a practical use leaves SQL as largely a black box in my mind (though I am somewhat familiar with technical concepts in databasing).
With that, I keep seeing [pic related] as proof that Elon Musk doesn't understand SQL.
Can someone give me a technical explanation for how one would come to that conclusion? I'd love if you could pass technical documentation for that.
SSN is also not a valid unique key, there have been situations with multiple people issued the same SSN:
https://en.wikipedia.org/wiki/Social_Security_number
Just read the format of the us ssn in that wikipedia. That wasnt a smart format to use lol. Only supports 99*999 ( +/- 100k ) people per area code. No wonder numbers are reused.
In some countries its birthday+sequence number encoded with gender+checksum and that has been working since the 80's.
Before that was a different number, but it wasnt future proof like the us ssn so we migrated away in the 80's :')
In my country the only way that someone has the same number is if someone was born on the same day (±1 century), in the same city and has the same name and family name. Is extremely difficult to have duplicates in that way (exception: immigrants, because the "city code" is the same for the whole foreign country, so it's not impossible that there are two Ananya Gupta born on the same day in the whole India)
Oh ye, our system wouldnt fit india as its limited to 500 births a day ( sequence is 3, digits and depending if its even or uneven describes your gender ). Your system seems fine to me and beats the us system hands down haha