Question

We can store null values in primary key field

Answer 1

No.

We can't have a Primary Key column with a NULL value. The reason for the same is very simple, primary key purpose is to uniquely identify records. If two records of a single column have a NULL value, the column values are not considered equal...

Answer 2

Answer:

hey mate . we cannot keep primary key together with the null key as primary key is kept for particular functions and null key I'd mainly a toggle key. hope u are able to understand this . thankyou .

hope it helps you brother