980 views
0 votes
0 votes
1.A primary key cannot be NULL (Any of its attributes can’t be NULL)

2.can candidate key be NULL(All attr) (Other than primary keys i,e alternate keys)

3.can some attributes of candidate key be NULL??

which of these are true . false

1 Answer

0 votes
0 votes
Primary key cannot be Null but Candidate key apart from Primary key may have Null values

Related questions

1 votes
1 votes
0 answers
1
JAINchiNMay asked Dec 1, 2022
443 views
Any attribute(s) determining a prime attribute, automatically becomes a prime(s) attributeTrue or false
0 votes
0 votes
1 answer
3
abhinowKatore asked Sep 8, 2022
263 views
If a schedule is not conflict-serializable. Is it serializable?
1 votes
1 votes
1 answer
4
Manisha Jaishwal asked Aug 10, 2022
348 views
S:- R1(x) R1(y) W1(x) R2(z) R2(y) W3(y) R2(y)Schedule is view Serializable or not ?