What potential pitfalls should be considered when using FETCH_GROUP in PHP PDO queries?

When using FETCH_GROUP in PHP PDO queries, one potential pitfall to consider is that the fetched data may not be grouped as expected, leading to unexpected results. To avoid this issue, it is important to ensure that the query and grouping columns are correctly specified to achieve the desired grouping. 

// Example of using FETCH_GROUP in PDO query with correct grouping columns specified
$stmt = $pdo->prepare("SELECT category, COUNT(*) as total FROM products GROUP BY category");
$stmt->execute();
$results = $stmt->fetchAll(PDO::FETCH_GROUP);

foreach ($results as $category => $products) {
    echo "Category: " . $category . " - Total Products: " . count($products) . PHP_EOL;
}

Keywords

FETCH_GROUP PHP PDO queries pitfalls

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