What is the implicit logical operator used in MongoDB?

In MongoDB, the implicit logical operator that is used when combining multiple conditions in a query is the logical AND operator. When you specify multiple criteria in a query without explicitly using any logical operators, MongoDB treats these conditions as though they are combined using a $and operation.

For instance, if you write a query that searches for documents that meet condition A and condition B (e.g., db.collection.find({ field1: value1, field2: value2 })), MongoDB interprets this as looking for documents where both criteria are true simultaneously. This behavior emphasizes that the implicit assumption is that all specified conditions must be satisfied for a document to be included in the result set.

The other logical operators like $or, $not, and $nor serve specific purposes and must be explicitly declared when needed, but the $and operator is the default assumption in multi-condition queries. Hence, understanding this implicit logic helps developers accurately frame their queries and anticipate the behavior of their requests against a MongoDB database.