What is the purpose of using GROUP_CONCAT in a MySQL query when retrieving data related to multiple groups and members?

When retrieving data related to multiple groups and members in MySQL, using GROUP_CONCAT allows us to concatenate the values from multiple rows into a single string. This is useful for displaying all members of a group in a single column, making the output more readable and easier to work with. 

$query = "SELECT group_name, GROUP_CONCAT(member_name) AS members 
          FROM groups 
          JOIN members ON groups.group_id = members.group_id 
          GROUP BY group_name";

$result = mysqli_query($connection, $query);

while($row = mysqli_fetch_assoc($result)) {
    echo "Group: " . $row['group_name'] . "<br>";
    echo "Members: " . $row['members'] . "<br><br>";
}

Keywords

PHP MySQL GROUP_CONCAT query data retrieval

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