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What is the primary purpose of joining in data processing?

• To encrypt data for security

• To delete unnecessary data

• To combine data from multiple sources

• To separate data into different tables

Which type of join would you use to include all records from the left table and matched records from the right table?

• Inner Join

• Right Join

• Left Join

• Full Outer Join

In which scenario is a full outer join most useful?

• When you need to update records

• When you need only unmatched records

• When you need all records from both tables, regardless of match

• When you need only matched records

What is a common use case for using joins in a database?

• To create a backup of the database

• To enhance the security of the database

• To reduce the size of the database

• To retrieve related data from multiple tables

Which join type would you use to ensure that all records from both tables are included, even if there are no matches?

• Inner Join

• Left Join

• Right Join

• Full Outer Join