Can we use more than one null value for unique key?
- 31 Answers
- 56792 Views
- A1 Technology, Wipro, I also Faced
- E-Mail Answers
Answer Posted / slimtech
The answer to this question depends on the database that we
are using
1. In SQL Server and DB2, we can insert only one null value
in the Unique Key column.
2. In Oracle, we can insert multiple null values
| Is This Answer Correct ? | 31 Yes | 0 No |
Post New Answer View All Answers
What are the types of queries in sql?
What is a join query?
what is the difference between truncate and drop statements? : Sql dba
C. Normalize the following data up to the 3rd Normal form. Create the tables and insert the data given. Emp_ID Name Dept_Name Salary Course_Title Date_Completed 100 Adam Marketing 48,000 SPSS 6/19/2008 Surveys 10/7/2008 140 Bob Accounting 52,000 Tax Acc 12/8/2008 110 Cathy IT SQL Server 1/12/2008 C# 4/22/2008 190 Dan Finance 150 Emily Marketing 55,000 SPSS 6/16/2008 42,000 Analysis 8/12/2008 Queries 1. Find all Names who have completed the SPSS Course. 2. Find employee with max salary. 3. Find employee with 2nd max salary. 4. Find all employees in Dept “Marketing”. 5. Find all the employees who have taken more than 2 courses. 6. Find all the employees who have completed the courses before month of September.
What is an ndf file?
Is stored procedure faster than query?
Why do we use sql constraints? Which constraints we can use while creating database in sql?
how to drop an existing index in mysql? : Sql dba
How do I edit a stored procedure?
What does where 1/2 mean in sql?
what are the t string functions available in tsql? : Transact sql
What is primary key and unique key?
Explain the uses of database trigger.
What does truncate mean in sql?
What is sqlexception in java?
