What is TRUE about UNION ALL Operator?
The results of both queries are combined with this operator.
After performing the UNION ALL operation, duplicate rows will not be removed.
Both A and B
None of the above
Correct Answer :
C. Both A and B
In the case of UNION ALL Operator -
a) The results of both queries are combined with this operator.
b) After performing the UNION ALL operation, duplicate rows will not be removed.
Related Questions
Which of the following are not MySQL Date and Time Data Type?
DATE
TIME(fsp)
YEAR
None of the above
What is the difference between UNION & UNION ALL operators?
Combining the results of two select statements will be done using UNION whereas combined records from both queries are returned by UNION ALL operator.
Combining the results of two select statements will be done using UNION ALL whereas combined records from both queries are returned by UNION operator.
After performing the UNION operation, duplicate rows will not be removed whereas after performing the UNION ALL operation, duplicate rows will be removed.
None of the above
What is meant by 'SQL is an interactive language'?
Learning and understanding SQL is easy
It can also be used for communicating with the database.
In a few seconds, complex queries can also be answered using this language.
All of the above
Which of the following is/are type of SQL Constraint?
Column Level
Table Level
Both A and B
None of the above
In the relational database, in order to modify index, we need to use which command?
ALTER
MODIFY
UPDATE
ADD
SQL contains which component in its process?
Optimization Engines
SQL Query Engines
Query Dispatchers
All of the above
In order to start the transaction, the command used is
Mysql > START COMMIT;
Mysql > START TRANSACTION;
Mysql > START ROLLBACK;
None of the above
Which of the following is a SQL Logical Operator?
SQL ALL Operator
SQL OR Operator
SQL LIKE Operator
All of the above
Which of the following is TRUE about The Foundation Rule in the 12 Codd's Rules?
Relational databases are required.
Databases contain a wide variety of information, and each row and column of each table must hold this information.
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.
The character(s) which are used independently or in conjunction with SQL Like Operator:
%
_
Both A. and B.
None of the above
Select the function which is not the Scalar Function(s)?
UCASE()
LEN()
SUM()
NOW()
In order to format, how the column should be displayed, which function is used?
FORM()
DISPLAY()
COL()
FORMAT()
Through which system, we can detect SQL Injection attacks?
Injection Detection System
Attack Detection System
Intrusion Detection System
None of the above
SQL INSERT is used to insert a
Single or Multiple record
Single or Multiple database
Single or Multiple table
None of the above
Which of the following is TRUE about UNIQUE constraint?
In columns that are subject to the UNIQUE constraint, duplicate values are not allowed.
Unique values will always be present in the column containing the unique constraint.
A single table can have more than one unique constraint, since it can be applied to more than one column.
All of the above
At which of the following stage does SQL Injection occurs?
When the user is asked to logout
When the user is asked to input password
When the user is asked to input captcha
When the user is asked to input username
What is the symbol of Concatenation Operator?
|
||
//
\
Description allows the Script to load the
Owner of the script
Script name
Script Editor
All of the above
The description in SQL Script, displays script in
One Line
Two Line
Three Line
Many Lines
What can be the maximum size of char(n) in SQL Server String Data Type?
7000
8000
9000
10000
The Web SQL API is supported by
Opera
Google Chrome
Android Browsers
All of the above
If multiple columns are used as Primary Key, it is known as
Unique
Composite
Foreign
None of the above
Which keyword is used in SQL Server to implement the auto increment?
UNIQUE
IDENTITY
INCREMENT
ADD
In order to update one table using another table and join condition, which statement is used.
SQL UPDATE INTO
SQL UPDATE JOIN
SQL JOIN
SQL JOIN UPDATE
Using which clause, can SQL EXCEPT be used in single table?
TO
AS
WHERE
IN
What does task list consist of in SQL Script?
Import
Show Quotas
Manage Results
All of the above
Which of the following statement is correct?
Comparison Operator has higher precedence than Conjuction Operator.
Identity Operator has higher precedence than Multiplication Operator.
Both A and B
None of the above
What will be the output of the below SQL statement?
25
26
25.65
25.00
In SQL, which statement can help in changing the name of the table?
RENAME
ALTER
Both A) and B)
None of the above
Which of the following statement is TRUE about Primary Key?
Table integrity is not enforced by the primary key.
The data in a primary key is always multiple.
900 bytes is the maximum length of a primary key.
Null values are allowed in primary keys.