MongoDB Mastering MongoDB for Beginners (Theory and Projects) - Solution ($exists)
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Information Technology (IT), Architecture
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University
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Practice Problem
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in working with a database collection?
Rename the collection
Create the collection
Delete the collection
Update the collection
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which operator is used to check if a field exists in a document?
less than
equals
greater than
exists
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What operator is used to combine multiple conditions in a query?
OR
NOT
AND
XOR
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which condition would you use to find documents with a 'quantity' of 20?
quantity != 20
quantity = 20
quantity > 20
quantity < 20
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