Mean Stack Technologies II (Angular MongoDB)

 studentsB> db.aids.find().count() 4 studentsB> db.aids.find().count() 4 studentsB> db.aids.find().limit(3) [   {     _id: ObjectId("66fa2428ca0fc631a23b264f"),     SRN: 201,     SName: 'A',     yr: 3   },   {     _id: ObjectId("66fa2479ca0fc631a23b2650"),     SRN: 202,     SName: 'B',     yr: 3   },   {     _id: ObjectId("66fa249eca0fc631a23b2652"),     SRN: 303,     SName: 'CC',     yr: 3   } ] studentsB> db.aids.find().limit(2) [   {     _id: ObjectId("66fa2428ca0fc631a23b264f"),     SRN: 201,     SName: 'A',     yr: 3   },   {     _id: ObjectId("66fa2479ca0fc631a23b2650"),     SRN: 202,     SName: 'B',     yr: 3   } ] studentsB> db.aids.find().sort() [   {     _id: ObjectId("66fa2428ca0fc631a23b264f"), ...

  In MongoDB, you can drop a database using the db.dropDatabase() method, and you can drop a collection using the db.collection.drop() method. Here's how you can use these commands: Drop a Collection : To drop a specific collection in MongoDB, you can use the db.collection.drop() method. Replace collection with the name of the collection you want to drop. Here's an example: use your_database_name // Switch to the appropriate database db.your_collection_name.drop() Replace your_database_name with the name of your database and your_collection_name with the name of the collection you want to drop. Drop a Database : To drop an entire database in MongoDB, you can use the db.dropDatabase() method. Be very careful when using this command because it will permanently delete the entire database and all its collections. use your_database_name // Switch to the appropriate database db.dropDatabase()

 abc123> db.eswar.insertOne({SRN:001,SName:'a',yr:3}) {   acknowledged: true,   insertedId: ObjectId("66f392b1d8b1cbf0117c527c") } abc123> db.eswar.insertOne({SRN:002,SName:'b',yr:3}) {   acknowledged: true,   insertedId: ObjectId("66f392cbd8b1cbf0117c527d") } abc123> db.eswar.insertOne({SRN:003,SName:'c',yr:2}) {   acknowledged: true,   insertedId: ObjectId("66f392e3d8b1cbf0117c527e") } abc123> db.eswar.find() [   {     _id: ObjectId("66f392b1d8b1cbf0117c527c"),     SRN: 1,     SName: 'a',     yr: 3   },   {     _id: ObjectId("66f392cbd8b1cbf0117c527d"),     SRN: 2,     SName: 'b',     yr: 3   },   {     _id: ObjectId("66f392e3d8b1cbf0117c527e"),     SRN: 3,     SName: 'c',     yr: 2   } ] abc123> show collections eswar abc123> db.eswar.update({SName:'C'},{$set:{yr:3}}) DeprecationWarni...

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