Hacker News new | ask | show | jobs
by cubefox 1064 days ago
I wonder how Codd's original relational algebra handled this case, as he didn't have NULL cells.
2 comments
Mikhail_Edoshin 1064 days ago
This part I do not know, but NULLs are either Codd’s idea or the one he sided with.

Another example when an invention goes against the established logic would be quaternions.

link
at_compile_time 1064 days ago
>Another example when an invention goes against the established logic would be quaternions.

How so?

link
bazoom42 1064 days ago
I don’t think it had outer joins.
link