What are the differences between using HAVING and ORDER BY in a PHP SQL query, and when should each be used?

HAVING is used to filter the results of a query based on a specified condition applied to grouped rows, while ORDER BY is used to sort the results of a query based on specified columns. HAVING is typically used with aggregate functions like COUNT, SUM, AVG, etc., while ORDER BY is used to sort the results based on specific columns in ascending or descending order. HAVING is used after the GROUP BY clause, while ORDER BY is used at the end of the query. Example PHP code snippet: 

$query = "SELECT column1, COUNT(column2) AS count_column2 
          FROM table_name 
          GROUP BY column1 
          HAVING count_column2 > 5 
          ORDER BY column1 DESC";

$result = mysqli_query($connection, $query);

while($row = mysqli_fetch_assoc($result)) {
    // Process the results
}

Keywords

PHP SQL query HAVING ORDER BY differences

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