MongoDB Mastering MongoDB for Beginners (Theory and Projects) - Solution ($exists)

The video tutorial guides viewers through creating a database collection, inserting data, and performing queries to find documents based on specific conditions. It covers how to identify documents with a 'qty' field, those without a 'code' field, and how to use the AND operator to combine conditions for more complex queries. The tutorial concludes with a solution to a quiz, reinforcing the concepts discussed.

What is the first step in working with a database collection?

• Rename the collection

• Create the collection

• Delete the collection

• Update the collection

Which operator is used to check if a field exists in a document?

• less than

• equals

• greater than

• exists

How can you find documents where the 'code' field is missing?

• Use the 'equals' operator

• Use the 'exists' operator with false

• Use the 'less than' operator

• Use the 'greater than' operator

What operator is used to combine multiple conditions in a query?

• OR

• NOT

• AND

• XOR

Which condition would you use to find documents with a 'quantity' of 20?

• quantity != 20

• quantity = 20

• quantity > 20

• quantity < 20