Waliullah A subquery is a query (SQL statement) inside another query.It’s like asking one question inside another question to get your final answer. Syntax: Example of a Subquery Imagine two tables: students id name class_id 1 Ramesh 101 2 Priya 102 3 Amit 101 classes class_id class_name 101 Science 102 Arts Question: Find students who belong … Read more
Here’s a simple and clear explanation of the difference between WHERE and HAVING in SQL: Quick Explanation Difference Between WHERE and HAVING Feature WHERE HAVING Purpose Filters rows before grouping (used on individual rows) Filters groups after grouping (used with GROUP BY) Used With Any table or query Only with GROUP BY or aggregate functions … Read more
Null-safe operator is a new syntax in PHP 8.0, that provides optional chaining feature to PHP. In PHP, when working with objects, sometimes a property or method may not exist (it can be null).Normally, checking this requires multiple if conditions to avoid errors. PHP 8 introduced the Nullsafe Operator (?->) to make this easy. Old Way (Before … Read more
Constructor Property Promotion is a new syntax in PHP 8 that allows class property declaration and constructor assignment right from the constructor. In PHP (before version 8), when we created a class, we had to: This meant writing a lot of repeated code. Old Way (Before PHP 8) Here we are writing $name and $age two times: New Way … Read more
The match expression, introduced in PHP 8.0, offers a modern way to handle multiple conditional checks. The new match expression in PHP 8 is a control flow structure that matches a given subject expression with one or more alternative conditional expressions using identity comparison and returns a value from the matched branch. Match expression syntax … Read more
PHP, and many other programming languages, support positional parameters: The caller passes the parameters in the same order the function/method declares its parameters. In PHP 8.0, Named Parameters support is added, which means it’s now possible to call a function/method by setting the parameters by their name. Named Arguments (introduced in PHP 8) let you … Read more
Multiple databases can be connected to Drupal using the Database API and configuring settings.php file. Use the Database API to connect to additional databases Add the database connection details to settings.php file Use the db_set_active() function to switch between databases Use the db_query() function to execute queries … Read more