sudo mongod --config /etc/mongod

Login to DB

mongo

Basics Queries

1. show dbs
2. Create database use mycustomers
3. Show current DB db
4. Create User

user: "sanjay",
pwd: "1234",
roles: ["readwrite", "dbadmin"]
})```

5. Create Collection(Tables) db.createCollection('customers')
6. Show Collections show collections
7. Insert data into the collections

  db.customers.insert(
    [
      {first_name: "vin", last_name: "diesel"},
      {first_name: "powel", last_name: "walker"}
    ]
  )```

8. Display the document(data) in the collections(table) db.customers.find()
9. Update

db.customers.update( {first_name: "vin"},
{first_name:"vinvin", gender: "male"} );```

Notice that update will have a new values as first_name and gender discarded last_name for that use $set as follows.

10. $set

db.customers.update({first_name: "vinvin"}, {$set:{phno: "123123"}} )```

11. Query particular document db.customers.find({first_name:"powel"})

12. pretty() db.news.find().pretty()

13. Update two or more fields

  db.customers.update({first_name: "powel"},
  {$set: {phno: 3434, gender: "male"}})```

14. Update whole document db.news.updateMany({}, {$set: {tag: ["sports", "technology"]}})

15. $unset operator delets a particular filed db.news.update({title: "B"}, {$unset: {likes: 1}})

16. upsert

  db.news.update({title: "D"},
  {title: "D", description: "know more about D",
  likes: 10, tag: ["sports", "technology"]},
  {upsert: true})```

`$rename` updates the name of the field
```db.news.update({},
 {rename: {tag: "tags"}})```

To update all

18 . remove db.news.remove({title: "D"})

19 . $gt db.news.find({dislikes: {$gt: 19}})