New course! Every coder should learn Generative AI!
Try a free lesson+ 1
Why mentioning NOT NULL while applying PRIMARY KEY constraint?
According to my experience with databases you don't need to do so!
2 Answers
0
Just an extra precaution to make sure it always has a value. Can really mess things up otherwise.
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?
Often have questions like this?
Learn more efficiently, for free:
Hot today
Android studio Tutorial
0 Votes
Why output is 0 for from_chars
2 Votes
Cyber security
0 Votes
Personal chat
1 Votes
Bash
0 Votes
Why exception is not handled
1 Votes
Help
0 Votes
Link
5 Votes
Error...
1 Votes