In what situations is it advisable to simplify SQL queries by removing conditional constructs in PHP?

It is advisable to simplify SQL queries by removing conditional constructs in PHP when the conditions can be handled more efficiently by the database itself. This can help improve performance and readability of the code. For example, instead of using PHP to filter results based on a condition, it is better to use the WHERE clause in the SQL query to filter the results directly.

// Example of simplifying SQL query by removing conditional constructs in PHP
// Original query with conditional construct
$condition = "active = 1";
$sql = "SELECT * FROM users WHERE $condition";

// Simplified query with WHERE clause
$sql = "SELECT * FROM users WHERE active = 1";