What common syntax errors can occur when using the GROUP BY clause in PHP queries?

Common syntax errors when using the GROUP BY clause in PHP queries include not properly specifying all non-aggregated columns in the SELECT statement or using aliases in the GROUP BY clause. To solve this issue, ensure that all non-aggregated columns in the SELECT statement are also included in the GROUP BY clause. Additionally, avoid using aliases in the GROUP BY clause, as it can lead to syntax errors.

// Incorrect query with syntax error
$query = "SELECT id, name FROM users GROUP BY id";

// Corrected query
$query = "SELECT id, name FROM users GROUP BY id, name";