MongoDB Data Insert, Batch Write & Logical Queries AND OR...

Data Insertion

Single Document Insert

db.collection.insertOne({
  name: "John Doe",
  age: 30,
  email: "john@example.com"
})

Batch Insert

Array batch insert:

db.collection.insert([
  {name: "Document 1", value: 100},
  {name: "Document 2", value: 200}
])

insertMany method:

db.collection.insertMany([
  {_id: 1, title: "Article A"},
  {_id: 2, title: "Article B"}
])

Comparison Operators

1. $eq: Equal to
2. $ne: Not equal to
3. $gt: Greater than
4. $gte: Greater than or equal to
5. $lt: Less than
6. $lte: Less than or equal to

Logical Queries

AND Conditions

db.collection.find({
    key1: value1,
    key2: value2
})

OR Conditions

db.collection.find({
    $or: [
        {age: {$lt: 20}},
        {age: {$gt: 30}}
    ]
})

NOT Conditions

db.collection.find({
    age: {$not: {$eq: 25}}
})

Application Examples

1. Query users aged between 20-30:

db.users.find({age: {$gte: 20, $lte: 30}})

2. Query users older than 25 or with income below 5000:

db.users.find({
    $or: [
        {age: {$gt: 25}},
        {income: {$lt: 5000}}
    ]
})