MongoDB

Question 1

What is MongoDB

Answer 1

No SQL or non-relational database

Question 2

Collection

Answer 2

A group of documents in MongoDB. Do not enforce a rigid schema

Question 3

Document

Answer 3

a record stored in JSON-like format, and each document in the collection has a different structure

Question 4

Visualize a collection

Answer 4

db.users({“name”:”Bob”, “age”:30}, {name:”Charlie”, “age”:35, “Hobbies”:[“cycling”,”hiking”]})

Question 5

Visualize a document

Answer 5

{“name”: “Alicce”, “age”:25}
documents ae stored ({..})

Question 6

Query using .find()

Answer 6

db.collection.find()

Question 7

Query with a condition

Answer 7

$gt
db.collection.find({“condition”:{“$gt”:x})

Question 8

Update a single document in a collection

Answer 8

$set
db.collection.updateOne({“name”:”Alice”},{“$set”:{“age”:26}})

Question 9

Delete a single document

Answer 9

.deleteOne
db.collection.deleteOne({“name”:”Alice”})

Question 10

Delete multiple documents

Answer 10

.deleteMany
db.users.deleteMany(“age”:{“$lt”:30}}) // Delets users younger than 30

Question 11

Delete a collection

Answer 11

.drop()
db.collection.drop()