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databases Online Quiz - 159

Description: databases Online Quiz - 159
Number of Questions: 20
Created by:
Tags: databases
Attempted 0/20 Correct 0 Score 0

A Literal is enclosed in double quotes.

  1. True

  2. False


Correct Option: B

SQL is

  1. Structured Query Language

  2. Standard Query Language

  3. System Query Language

  4. Simple Query Language


Correct Option: A

Limiting the rows in a select statement for a specific condition is done by the clause

  1. Distinct

  2. Projection

  3. Where

  4. All of the above


Correct Option: C

Character values are case insensitive

  1. True

  2. False


Correct Option: B

Arithmetic expressions containing a null value evaluate to null.

  1. True

  2. False


Correct Option: B
Explanation:

To solve this question, the user needs to know the concept of null values in arithmetic expressions.

The correct answer is:

The Answer is: B

Explanation:

The statement is false. Arithmetic expressions containing a null value do not evaluate to null. In most programming languages, performing arithmetic operations with a null value will result in the entire expression evaluating to null. However, this behavior depends on the programming language and the data type being used. In some cases, arithmetic expressions with null values may result in a runtime error or undefined behavior.

Concatenation operator is

  1. +

  2. -

  3. ||

  4. *


Correct Option: C

What are SQL “SELECT” statement capabilities.

  1. Projection

  2. Selection

  3. Join

  4. All of the above


Correct Option: D

To select all the columns from a table EMP, which one of the following is TRUE?

  1. Select all columns from EMP;

  2. Select distinct columns from EMP;

  3. Select * from EMP;

  4. All of the above


Correct Option: C

Select ename from emp where ename =”Scott”; This select statement executes successfully.

  1. True

  2. False


Correct Option: B

A Literal is enclosed in double quotes.

  1. True

  2. False


Correct Option: B

SQL is

  1. Structured Query Language

  2. Standard Query Language

  3. System Query Language

  4. Simple Query Language


Correct Option: A

Duplicate values are eliminated by which keyword

  1. Duplicate

  2. Distinct

  3. Remove

  4. Delete


Correct Option: B

The two types of subqueries are:

  1. Single-row subquery, Double-row subquery

  2. Double-row subquery, Multiple-row subquery

  3. Multiple-row subquery

  4. Single-row subquery and Multiple subquery


Correct Option: D

Single-row subquery returns:

  1. Only one row

  2. Two rows

  3. Zero rows

  4. There is no such subquery


Correct Option: A

What is the result of the query below? SELECT Stud_name, Rollnum FROM STUDENT WHERE stud_marks=(SELECT MIN (stud_marks) FROM STUDENT GROUPBY Rollnum);

  1. It gives the name and marks of all the students.

  2. It does not return anything.

  3. It shows an error saying” INVALID SYNTAX ERROR”

  4. It shows an error saying” Single-row subquery returns more than one row


Correct Option: D

Which of the following is not a multiple-row operator?

  1. IN

  2. OF

  3. ALL

  4. ANY


Correct Option: B

Which operator compares a value to every value returned by a subquery?

  1. IN

  2. OF

  3. ALL

  4. ANY


Correct Option: C

A DML statement is executed when you

  1. Add new rows to a table

  2. Modify existing rows of a table

  3. Remove existing rows from a table

  4. All of the above


Correct Option: D

The right syntax insert a row into a table is

  1. Insert to table tablename (….);

  2. Insert into table tablename (….);

  3. Insert into table tablename values (…..);

  4. Any one of the above


Correct Option: C

Which is the function that records the current date?

  1. Date

  2. Sysdate

  3. Current Date

  4. System Date


Correct Option: B
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