undefined | Better HN

0 pointscubefox2y ago0 comments

I wonder how Codd's original relational algebra handled this case, as he didn't have NULL cells.

0 comments

3 comments · 2 top-level

Mikhail_Edoshin2y ago· 1 in thread

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.

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

How so?

I don’t think it had outer joins.

j / k navigate · click thread line to collapse