How to do multiple while query from 2 different tables in mysql? - php

Question

How can I do multiple while query from 2 different table?
My code looks like this now:
$query = "SELECT * FROM user_group WHERE email = '$email'";
$result = mysqli_query($connection, $query);
$row = mysqli_fetch_assoc($result);
$group = $row['group'];
$sql = "SELECT * FROM matches WHERE group_name1 = '$group' OR group_name2 = '$group'";
$result = $connection->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
//some HTML code
}
}
?>
It's works but showing only one row from the matches table because of the first query (?) where I get the '$row['group'];'

Answer 1

You need to loop through all the results from the first query, and then perform the second query within the loop.
But it's better to join the two queries into one.
$query = "
SELECT m.col1, m.col2, m.col3, ...
FROM matches AS m
JOIN user_group AS g ON g.group IN (m.group_name1, m.group_name2)
WHERE g.email = ?";
$stmt = $connection->prepare($query);
$stmt->bind_param("s", $email);
$stmt->execute();
$stmt->bind_result($col1, $col2, $col3, ...);
while ($stmt->fetch()) {
// some code that uses the variables $col1, $col2, $col3, ...
}
Replace col1, col2, col3, etc. with the actual column names from your table.