What is the significance of using LEFT JOIN when comparing tables in PHP?

When comparing tables in PHP, using a LEFT JOIN allows you to retrieve all records from the left table (the first table mentioned in the JOIN clause) along with matching records from the right table. This is useful when you want to include all records from the left table even if there are no corresponding records in the right table. 

$query = "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.id";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0){
    while($row = mysqli_fetch_assoc($result)){
        // Process the data
    }
}

Keywords

LEFT JOIN tables comparison PHP significance

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