NULL means
ZERO
-1
1
Empty
Correct Answer :
D. Empty
NULL means empty, not even zero.
Related Questions
Why index is important in SQL?
The large database can be searched quickly with SQL Indexes.
The concept below is a quick way to include different values in those columns.
A smaller table may not recognize the performance of an index when used with an index.
All of the above
What is TRUE about SAVEPOINT?
Following the completion of a transaction, it must be executed to save all the operations performed in the transaction.
A transaction can be rolled back to its last saved state.
A specific part of a transaction can be given a name
None of the above
What is the work of SELECT command?
Database objects such as tables, table views, and other objects can be deleted using this command.
Database objects such as tables, table views, and other objects can be deleted using this command.
One or more rows from one or more tables of the database can be accessed with this command. Using the WHERE clause with this command is also possible.
It enables you to create new databases, tables, table views, and other objects using this command.
Which function returns the correct date and time?
DATE()
NOW()
TIME()
DATETIME()
Following the completion of a transaction, it must be executed to save all the operations performed in the transaction. Here we are talking about which command?
REVOKE
COMMIT
ROLLBACK
SAVE
What is TRUE about the Active/Dynamic Online Catalog based on the relational model in the 12 Codd's Rules?
The primary key value, table name, and column name are characteristics that allow us to access the precise data (atomic value) logically from a relational database.
Null values are treated in database records according to this rule.
Database dictionaries represent the complete logic of all descriptive data, which must be stored online.
None of the above
Which of the following keyword is used to delete the Join?
DELETE
ON
WHERE
All of the above
What does the SELECT Statement do?
Data is read from the SQL database by this statement and displayed to the database user.
The stored data in the SQL database is changed or modified by this SQL statement.
By deleting the stored data, this SQL statement deletes the database.
A new table in SQL is created using this SQL statement.
Foreign key is a field in a table that is _______ key in another table?
Primary
Unique
Composite
None of the above
To rename the Index, we need to use which command?
RENAME
ALTER
UPDATE
ADD
Which of the following clause cannot be used in SQL sub queries?
GROUP BY
ORDER BY
DELETE
FROM
What does the following statement do?
Finds any values that start with a
Finds any values that start with a%
Finds any values that contains only two characters starting with a
All of the above
Which of the following is TRUE about SQL Auto Increment?
It increments the unique number automatically.
It decrements the unique number automatically.
It keeps the unique number constant
None of the above
To add a Primary Key constraint after table is created, which clause is used?
UPDATE
ADD
ALTER
JOIN
What is the syntax of SQL CAST Function?
CAST (expression AS [data type])
CAST (expression IN [data type])
CAST (expression TO [data type])
CAST (expression FOR [data type])
What is TRUE about NOT IN clause?
The result is purged of duplicates
Duplicate records are not removed
Performs column-by-column comparisons
None of the above
Command that comes under DCL is/are -
GRANT
REVOKE
Both A. and B.
None of the above
SQL has the advantage of?
SQL require a lot of programming.
SQL provides High-Speed Query Processing.
SQL follows the standard languages of ANSI and ISO.
SQL is easily portable.
Types of SQL Commands are
DDL
DML
DCL
All of the above
Which of the following statement is TRUE?
A DATABASE name can be renamed.
A TABLE name can be renamed.
Both A and B
None of the above
SQL Division operator divides the operand on the ____ side by the operand on the ____ side.
Left, Left
Right, Left
Left, Right
Right, Right
What is the keyword of the Ascending and Descending?
ASCE, DESC
ASC, DES
ASCE, DES
ASC, DESC
SQL BETWEEN is a ______ operator.
Relational
Logical
Arithmetic
Assignment
Numbers of operand used by Binary Operators are?
1
2
3
4
Which function is used to extract substrings from the column of the table
ROUND()
MID()
FORMAT()
NOW()
What is the difference between Column Level and Table Level Constraints?
Constraints are applied to a single row using Column Level Constraints whereas Multiple rows can be constrained using a Table Level Constraint.
Constraints are applied to multiple rows using Column Level Constraints whereas a single row can be constrained using a Table Level Constraint.
Constraints are applied to a single column using Column Level Constraints whereas Multiple columns can be constrained using a Table Level Constraint.
Constraints are applied to multiple columns using Column Level Constraints whereas only a single column can be constrained using a Table Level Constraint.
Which statement is used to select the database in SQL?
SELECT
USE
ALTER
CREATE
Difference between GRAND & REVOKE command is/are?
The GRANT command can be used to grant a user access to databases and tables whereas The REVOKE command can be used to revoke all access privileges already assigned to the user.
The REVOKE command can be used to grant a user access to databases and tables whereas The GRANT command can be used to revoke all access privileges already assigned to the user.
A transaction can be rolled back to its last saved state.
None of the above
In case of ____Rule, the primary key value, table name, and column name are characteristics that allow us to access the precise data (atomic value) logically from a relational database.
Systematic Treatment of Null Values
Guaranteed Access
View Updating
Physical Data Independence
To get the table's previous permanent status, use the ____ command.
Commit
Transaction
Rollback
None of the above