I don't understand the logic here.
It seems the one-to-one and one-to-many relationships don't follow the same logic in these two pictures, why?
2 answers ( 0 marked as helpful)
Hi Ramsey!
Thanks for reaching out.
A customer may purchase many products, but a particular product is linked to only one customer. Later, in the lecture the cardinanality constraints are added. So, please watch the whole lecture. Thank you.
Hope this helps.
Best,
Tsvetelin
Hello Tsvetelin,
I did understand the top picture relationship. I have a hard time understanding the bottom picture relationships. Looking at employees and salaries table it looks like their relationship shown as one to many. An employee can have multiple salaries, but a particular salary is linked to only one employee! That's what it says. Why?
