Backup and Restore Facility of MongoDB
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MongoDB provides backup and restore facilities to protect database data from accidental deletion, hardware failure, corruption, or other problems. 1. Backup in MongoDB Backup means creating a copy of the…
Arithmetic Aggregation Operators in MongoDB
Arithmetic aggregation operators are used to perform mathematical calculations on numeric values in MongoDB aggregation pipelines. They are commonly used with stages such as $project, $addFields, and $group. They are…
String Aggregation Operators in MongoDB
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,…
How to Perform JOIN Operation in MongoDB
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.…
List out hook in wordpress.
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…
simple normal WordPress theme using the five main files:
Create the folder here: 1. style.css 2. functions.php 3. header.php 4. index.php 5. footer.php How the files work together Important WordPress functions File Main purpose style.css Theme information and design/CSS…
Explain different widgets.
Different Widgets in WordPress Widgets are small blocks of content or functionality that can be added to different areas of a WordPress website, such as the sidebar, footer, header, or…
MongoDB distinct() Operator & MongoDB aggregate()
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…
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 Collection Suppose emp…
MongoDB Element Query Operators and Array Query Operators
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.…