# Basic MongoDB query documents

# Empty document
{}

# Simple equality
{ "name": "Alice" }

# Multiple fields
{ "name": "Alice", "age": 30 }

# Nested document
{ "address": { "city": "NYC", "state": "NY" } }

# Integer value
{ "count": 42 }

# Float value
{ "price": 19.99 }

# Boolean values
{ "active": true }
{ "deleted": false }

# Null value
{ "middleName": null }

# Array value
{ "tags": ["mongodb", "database", "nosql"] }

# Nested arrays
{ "matrix": [[1, 2], [3, 4]] }

# Mixed types in array
{ "data": [1, "two", true, null, { "x": 3 }] }

# Dot notation field (as string key)
{ "address.city": "NYC" }

# ObjectId
{ "_id": ObjectId("507f1f77bcf86cd799439011") }