Query Operators ($eq $gt $lt $in) की जानकारी

test> db.products.insertMany([
...   { _id: 1, name: "Pen", price: 3 }, { _id: 2, name: "Book", price: 12 },
...   { _id: 3, name: "Lamp", price: 45 }, { _id: 4, name: "Desk", price: 150 }
... ])
{
  acknowledged: true,
  insertedIds: { '0': 1, '1': 2, '2': 3, '3': 4 }
}
test> db.products.find({ price: { $gt: 10 } }, { _id: 0 })
[
  { name: 'Book', price: 12 },
  { name: 'Lamp', price: 45 },
  { name: 'Desk', price: 150 }
]
test> db.products.find({ price: { $gte: 10, $lt: 100 } }, { name: 1, _id: 0 })
[ { name: 'Book' }, { name: 'Lamp' } ]
test> db.products.find({ name: { $in: ["Pen", "Desk"] } }, { name: 1, price: 1, _id: 0 })
[ { name: 'Pen', price: 3 }, { name: 'Desk', price: 150 } ]

⚠️ Run this in your own terminal or Node.js environment.