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Why mentioning NOT NULL while applying PRIMARY KEY constraint?

According to my experience with databases you don't need to do so!

23rd Jun 2019, 3:45 PM
Yasser AKBBACH
Yasser AKBBACH - avatar
2 odpowiedzi
0
Just an extra precaution to make sure it always has a value. Can really mess things up otherwise.
23rd Jun 2019, 5:36 PM
Jackson O’Donnell
0
I know what's the meaning of PK, my input was about that PK = NOT NULL + UNIQUE + INDEX why they need to mention NOT NULL twice at the table creation?
23rd Jun 2019, 11:56 PM
Yasser AKBBACH
Yasser AKBBACH - avatar