Can we use more than one null value for unique key?
Answer Posted / anil kumar abbireddy
We can insert any number of null values in the column which
contains the unique key
the reason is NULL is not equal to anothere NUll
so each null is different so there is no question of
duplication
| Is This Answer Correct ? | 140 Yes | 30 No |
Post New Answer View All Answers
Define tables and fields in a database
What is microsoft t sql?
What do you mean by query optimization?
What are operators available in sql?
how to include character strings in sql statements? : Sql dba
what is not null constraint? : Sql dba
what is the command line end user interface - mysql? : Sql dba
how to select unique records from a table? : Sql dba
Which join is default?
explain the options of myisamchk to improve the performance of a table. : Sql dba
What is meant by <> in sql?
Can function return multiple values in sql?
What is package in pl sql with an examples?
Are dml statements autocommit?
What is an oracle stored procedure?