When using ORDER BY in MySQL queries involving JOIN operations, what are some key factors to keep in mind for proper sorting of the results?

When using ORDER BY in MySQL queries involving JOIN operations, it's important to specify the table alias along with the column name in the ORDER BY clause to avoid ambiguity. This ensures that the sorting is performed correctly across the joined tables. Additionally, you should consider the performance implications of sorting large result sets and use appropriate indexes to optimize the query execution. 

$sql = "SELECT * 
        FROM table1 
        JOIN table2 ON table1.id = table2.table1_id 
        ORDER BY table1.column_name ASC, table2.column_name DESC";
$result = mysqli_query($conn, $sql);

Keywords

ORDER BY MySQL JOIN sorting results

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