How many null values can be inserted in a coulmn whihc is unique constraint
Answer Posted / amit
Any no. of times you can insert null values in a coulmn
whihc is unique constraint because a Null value is
undefined,unassigned,and unapplicable value so thats why we
cannot compaire with any other null value or other value.
| Is This Answer Correct ? | 8 Yes | 2 No |
Post New Answer View All Answers
What is cartesian join in sql?
what is cursor. write example of it. What are the attributes of cursor.
How can we find duplicate records in a table?
How to check if a column is nullable before setting to nullable?
What is a join query?
What are sql constraints?
What does rownum mean in sql?
How to convert comma separated string to array in pl/sql?
How do I run a script in sql developer?
Are null values same as that of zero or a blank space?
How do I upgrade sql?
Can we delete column in sql?
Why is the cursor important?
What are the ways on commenting in a pl/sql code?
what is innodb? : Sql dba