SQL Concepts and Operations

This video tutorial by Mosh Hamedani provides a comprehensive introduction to SQL, covering installation, database creation, and writing basic to advanced queries. It explains SQL operators, joins, and data manipulation techniques, offering practical exercises to reinforce learning.

What is the primary purpose of SQL?

• To design graphics

• To manage and manipulate data in relational databases

• To create web pages

• To write operating systems

Which of the following is NOT a relational database management system?

• SQL Server

• MongoDB

• Oracle

• MySQL

In SQL, what does the SELECT statement do?

• Creates a new database

• Deletes data from a table

• Retrieves data from a database

• Updates data in a table

Which operator would you use to filter results based on multiple conditions?

• AND

• LIKE

• IN

• BETWEEN

Which special character in regular expressions is used to indicate the start of a string?

• []

• |

• ^

• $

What SQL operator would you use to find records with missing values?

• LIKE

• BETWEEN

• IS NOT NULL

• IS NULL

In SQL, what is the purpose of using an alias?

• To delete a table

• To rename a table or column for easier reference

• To update a table

• To create a new table

What is the main advantage of using the USING clause in SQL joins?

• It allows for joining tables without specifying any conditions.

• It simplifies the join condition when column names are the same in both tables.

• It automatically creates a cross join between tables.

• It ensures that only unique records are returned.

Which SQL join type combines every record from one table with every record from another table?

• Inner Join

• Left Join

• Cross Join

• Self Join

When inserting data into a table with an auto-increment column, what is the recommended approach?

• Use a subquery to determine the next value.

• Leave the column out of the insert statement entirely.

• Use the DEFAULT keyword to let the database handle the value.

• Manually specify the value for the auto-increment column.