What are the benefits of using INNER JOIN and GROUP_CONCAT functions in PHP for querying data from multiple tables?

When querying data from multiple tables in PHP, using INNER JOIN allows you to combine rows from different tables based on a related column between them. This ensures that only rows with matching values in both tables are returned. Additionally, using the GROUP_CONCAT function helps to concatenate the values of a column across multiple rows into a single string, making it easier to display or process the data. 

$query = "SELECT table1.column1, GROUP_CONCAT(table2.column2) 
          FROM table1 
          INNER JOIN table2 ON table1.id = table2.table1_id 
          GROUP BY table1.id";
$result = mysqli_query($conn, $query);
if(mysqli_num_rows($result) > 0){
    while($row = mysqli_fetch_assoc($result)){
        echo $row['column1'] . ": " . $row['GROUP_CONCAT(table2.column2)'] . "<br>";
    }
}

Keywords

INNER JOIN GROUP_CONCAT PHP querying data multiple tables

Related Questions