How can PHP developers ensure proper aggregation and grouping in MySQL queries to avoid incorrect results?

When aggregating and grouping data in MySQL queries, PHP developers should ensure that all non-aggregated columns in the SELECT clause are included in the GROUP BY clause to avoid incorrect results. This ensures that the data is properly grouped before any aggregation functions are applied. Failing to do so can lead to unexpected results where data is grouped incorrectly.

$query = "SELECT column1, SUM(column2) FROM table_name GROUP BY column1";