Free Back-End Development MCQ Questions and Answers

Question 1

A component of SQL used to access, and add the total number of records in a table can be obtained using an integrated aggregate function (will NOT ignore null values in columns) and remove data from databases.

Accepted Answer

DML (Data Manipulation Language)

Answer

Explanation:
DML (Data Manipulation Language) is a part of SQL that is used to query, insert, update, and remove data from a database. Examples of DML statements include SELECT (to query data), INSERT (to add new data), UPDATE (to modify existing data), and DELETE (to remove data).

Question 2

The total number of records in a table can be obtained using an integrated aggregate function (will NOT ignore null values in columns).

Accepted Answer

Count(*)

Answer

Explanation:
COUNT(*) is a built-in aggregate function in SQL that is used to return the total number of records in a table, including null values in the columns. The asterisk (*) is used to indicate that you want to count all the rows in the table.

Question 3

A broad view of a database showing all its tables and connections.

Accepted Answer

Schema

Answer

Explanation:
In database management systems, a schema is an overall view that represents the tables and relationships of an entire database. It provides a logical structure for organizing and displaying data in a database. A schema can be thought of as a blueprint or a plan for the database.

Question 4

Contains two ID values and, if available, other details.

Accepted Answer

Linking Table

Answer

Explanation:
A linking table is a table in a relational database that contains two ID values from different tables and optionally additional information.

Question 5

A set of data spanning all rows in a table with the same datatype (records)

Accepted Answer

Column

Answer

Explanation:
In a relational database, a column represents a set of data having the same data type in a table, spanning all rows or records. Each column in a table has a unique name and a specific data type, such as integer, string, date, etc.

Back-End Development Practice Test

Back-End Development Practice Test

Free Back-End Development MCQ Questions and Answers