MongoDB - Blog

db.students.insertMany([
{
"student_id": "S001",
"name": "Santhosh",
"age": 20,
"department": "CSBS",
"year": 2,
"cgpa": 9
},
{
"student_id": "S002",
"name": "Aarav",
"age": 21,
"department": "CSE",
"year": 3,
"cgpa": 8.5
},
{
"student_id": "S003",
"name": "Meera",
"age": 19,
"department": "ECE",
"year": 1,
"cgpa": 7.2
},
{
"student_id": "S004",
"name": "Divya",
"age": 22,
"department": "CSE",
"year": 3,
"cgpa": 9.1
},
{
"student_id": "S005",
"name": "Rohan",
"age": 20,
"department": "MECH",
"year": 2,
"cgpa": 6.8
}
])
Read (Query)
Display all student records
js
db.students.find()
Find all students with CGPA > 8
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db.students.find({ cgpa: { $gt: 8 } })
Find students belonging to the Computer Science department
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db.students.find({ department: "CSE" })
Update
Update the CGPA of a specific student (e.g., student_id: "S003")
js
db.students.updateOne(
{ student_id: "S003" },
{ $set: { cgpa: 7.8 } }
)
Increase the year of study for all 3rd year students by 1
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db.students.updateMany(
{ year: 3 },
{ $inc: { year: 1 } }
)
Delete
Delete one student record by student_id (e.g., "S005")
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db.students.deleteOne({ student_id: "S005" })
Delete all students having CGPA < 7.5
js
db.students.deleteMany({ cgpa: { $lt: 7.5 } })