Query Techniques
In this section, you will explore advanced querying techniques for database management. Proper querying is essential for efficient data retrieval and analysis. This section will provide detailed methods and best practices to ensure precision and efficiency in queries.
Logical and comparison operators
In MongoDB Query Language, logical and comparison operators are fundamental constructs that allow users to filter and select data based on specific conditions. They provide a means to perform tests on data and determine which documents match the given criteria:
$or: Use this operator to perform a logicalORoperation and return documents that match any of the conditions specified in its array.
Example: Find documents where the age is either 18 or 25.
Input
[
  { "_id": 1, "name": "Alice", "age": 18 },
  { "_id": 2, "name": "Bob", "age": 25 },...
