My Blog
String aggregation operators are used to perform various operations on textual/string data stored in MongoDB document fields. They are commonly used inside the Aggregation Pipeline, especially with the $project stage,…
MongoDB is a NoSQL database, so it does not use the traditional SQL JOIN statement. However, MongoDB provides the $lookup aggregation stage to perform a join between two collections. 1.…
Hooks in WordPress are functions that allow developers to modify or add functionality to WordPress without changing the core files. There are two main types of hooks: A. Action Hooks…
MongoDB distinct() Operator In MongoDB, distinct() is used to find unique values of a particular field from a collection. It returns the unique values in an array. Syntax Example: Employee…
In MongoDB, distinct() is used to find unique values of a particular field from a collection. It returns the unique values in an array. Syntax Example: Employee Collection Suppose emp…
MongoDB Query Operators 1. Element Query Operators Element operators are used to check the existence and data type of a field. $exists Checks whether a field exists in a document.…
These three methods are commonly used with find() to sort records, skip records, and restrict the number of records returned. Assume we have a students collection: Example data: 1. sort()…
In MongoDB, remove() is used to delete documents from a collection. Note: remove() is an older MongoDB method. In modern MongoDB, use deleteOne() or deleteMany(). 1. Remove One Document Suppose:…
Here are different MongoDB update() examples in English, explained simply. Note: In modern MongoDB, use updateOne() and updateMany() instead of the older update() method. 1. Update One Field Suppose we…
Below is a complete Employee (emp) practical example with data and common find() queries, including AND, OR, NOT, and NOR. 1. Create Database and Employee Collection Insert employee records: 2.…
admin