Question

. which of the following rule(s) is true for Primary Key. i) A Primary Key does not allow null values. ii) A primary key allow null values. iii) A Primary Key must always have a unique value. iv) A Primary Key allow a common value only. * 2 points a) i & iii b) i & iv c) ii & iv d) all​

Answer 1

Answer:

a primary key does not allow thanks values is true have a nice day