mongodbHow to use the "and" operator in MongoDB?

The and operator in MongoDB is used to combine two or more expressions and retrieve documents that match all the expressions in the query.

For example, the following query will return documents that have the name field set to John and the age field set to 25:

db.collection.find({name: "John", age: 25})

The output of the above query will be documents that match both the name and age criteria:

{
  "_id": ObjectId("5f3d7f3f3f3f3f3f3f3f3f3f"),
  "name": "John",
  "age": 25
}

The and operator can also be used to combine multiple expressions in a single query. For example, the following query will return documents that have the name field set to John, the age field set to 25 and the gender field set to male:

db.collection.find({name: "John", age: 25, gender: "male"})

The output of the above query will be documents that match all the criteria:

{
  "_id": ObjectId("5f3d7f3f3f3f3f3f3f3f3f3f"),
  "name": "John",
  "age": 25,
  "gender": "male"
}

The and operator can also be used to combine multiple expressions in a single query using the $and operator. For example, the following query will return documents that have the name field set to John and the age field set to 25 or the gender field set to male:

db.collection.find({$and: [{name: "John"}, {$or: [{age: 25}, {gender: "male"}]}]})

The output of the above query will be documents that match either the name and age criteria or the name and gender criteria:

{
  "_id": ObjectId("5f3d7f3f3f3f3f3f3f3f3f3f"),
  "name": "John",
  "age": 25
},
{
  "_id": ObjectId("5f3d7f3f3f3f3f3f3f3f3f3f"),
  "name": "John",
  "gender": "male"
}

Helpful links

• MongoDB Documentation - Logical Query Operators

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