How can PHP developers ensure that the results of a MySQL query are sorted correctly before applying GROUP BY?

When using GROUP BY in MySQL, the results of a query may not be sorted as expected unless an ORDER BY clause is used before applying the GROUP BY. To ensure that the results are sorted correctly, PHP developers can include an ORDER BY clause in their SQL query before using GROUP BY. 

// Connect to MySQL database
$mysqli = new mysqli("localhost", "username", "password", "database");

// Query to select data from table and sort by a specific column before grouping
$query = "SELECT * FROM table_name ORDER BY column_name GROUP BY group_column";

// Execute the query
$result = $mysqli->query($query);

// Fetch and display results
while ($row = $result->fetch_assoc()) {
    echo $row['column_name'] . "<br>";
}

// Close database connection
$mysqli->close();

Keywords

PHP MySQL query sorting GROUP BY

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