Basic Query Operators: Comparison and Logical Operators
Learn to use MongoDB query operators, including comparison, logical, and element operators, to filter and retrieve data based on specific conditions, document existence, and data types.
We'll cover the following...
In MongoDB, query operators are special symbols or keywords that allow us to specify conditions for matching documents in our database. They help create more flexible and powerful queries to filter and retrieve data.
There are three basic types of query operators:
Comparison operators: They filter documents based on value comparison.
Logical operators: They combine multiple conditions in a query.
Element operators: They check for the existence of fields or their data types.
They're used within the .find() method and applied to the field's value directly. These operators are always prefixed with a $ symbol. Let's look at them in detail below.
Comparison operators
In real-world scenarios, the database is normally large, and we do not always want to see all the documents. Depending on the use case, we require selected documents only. ...