This content originally appeared on DEV Community and was authored by SASHMITHA G 24CB054
MongoDB is a powerful NoSQL database that allows flexible storage of JSON-like documents. In this blog, we’ll explore CRUD operations — Create, Read, Update, and Delete — using a simple college students collection.
🧱 Step 1: Create (Insert)
We start by inserting student records into the students collection. Each document follows this structure:
{
"student_id": "S001",
"name": "Soniya",
"age": 20,
"department": "CSBS",
"year": 2,
"cgpa": 9
}
Insert five students:
db.students.insertMany([
{ "student_id": "S001", "name": "Soniya", "age": 20, "department": "CSBS", "year": 2, "cgpa": 9 },
{ "student_id": "S002", "name": "Isha", "age": 21, "department": "CSE", "year": 3, "cgpa": 8.5 },
{ "student_id": "S003", "name": "Sashmi", "age": 22, "department": "ECE", "year": 4, "cgpa": 7.2 },
{ "student_id": "S004", "name": "Priya", "age": 19, "department": "CSBS", "year": 1, "cgpa": 9.3 },
{ "student_id": "S005", "name": "Alice", "age": 20, "department": "Mechanical", "year": 2, "cgpa": 6.8 }
]);
🔍 Step 2: Read (Query)
- Display all student records:
db.students.find().pretty();
- Find students with CGPA > 8:
db.students.find({ cgpa: { $gt: 8 } }).pretty();
- Find students from the Computer Science department (CSBS):
db.students.find({ department: "CSBS" }).pretty();
✏ Step 3: Update
- Update CGPA of a specific student (e.g., student_id = "S002"):
db.students.updateOne(
{ student_id: "S002" },
{ $set: { cgpa: 8.8 } }
);
- Increase the year of study for all 3rd year students by 1:
db.students.updateMany(
{ year: 3 },
{ $inc: { year: 1 } }
);
🗑 Step 4: Delete
- Delete a student by student_id (e.g., "S005"):
db.students.deleteOne({ student_id: "S005" });
- Delete all students with CGPA < 7.5:
db.students.deleteMany({ cgpa: { $lt: 7.5 } });
🧠 Key Takeaways
Create: Insert documents using insertOne or insertMany.
Read: Use find with filters to query documents.
Update: Modify single or multiple documents using updateOne/updateMany.
Delete: Remove documents with deleteOne or deleteMany.
MongoDB makes CRUD operations intuitive and flexible, especially for JSON-like data structures, making it perfect for applications like student management systems.
Thank you @santhoshnc sir for guiding me..
MongoDB #NoSQL #CRUD #DatabaseLearning #DataEngineering #DevCommunity
This content originally appeared on DEV Community and was authored by SASHMITHA G 24CB054
SASHMITHA G 24CB054 | Sciencx (2025-10-04T10:19:01+00:00) Hands-On MongoDB CRUD Operations with a College Student Schema. Retrieved from https://www.scien.cx/2025/10/04/hands-on-mongodb-crud-operations-with-a-college-student-schema-2/
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