Problem Statement
Explain the difference between $in and $or operators in MongoDB queries.
Explanation
The dollar in operator is used when you want to match documents where a field's value equals any value in a specified array. It works on a single field and is more concise and efficient for checking multiple possible values.
The dollar or operator is used when you need to match documents that satisfy at least one of multiple conditions, which can involve different fields or complex expressions. For example, dollar or can check if age is greater than 30 or city equals New York, involving different fields.
Use dollar in when checking if one field matches any of several values. Use dollar or when you have multiple conditions on different fields or need complex logic. The dollar in operator is generally more efficient than dollar or when both can achieve the same result on a single field.
Code Solution
SolutionRead Only
// $in operator - single field, multiple values
db.users.find({
status: { $in: ["active", "pending", "verified"] }
})
// $or operator - multiple conditions
db.users.find({
$or: [
{ age: { $gt: 30 } },
{ city: "New York" },
{ status: "premium" }
]
})