Get value of another column based on foreign key - php

Question

I am displaying all data from a table in a view for the administrator in a web app.
The SQL looks something like this:
$organizations = $db->query("
SELECT id, organization_name, owner_id
FROM organizations
ORDER BY created_on DESC
")->fetchALL(PDO::FETCH_ASSOC);
The part of the view I am working with is as follows:
<?php foreach($organizations as $organization): ?>
<tr>
<td><?php echo e($organization['organization_name']); ?></td>
<td><?php echo e($organization['owner_id']); ?></td>
</tr>
<?php endforeach; ?>
This works exactly as expected but is not actually what I want to display as far as the owner_id (an int and the primary key of the users table)
This will generate a table with all the values as in the SQL statement and in particular it will render the owner_id to the view which is a foreign key related to my users table.
What I want to do is actually display the name of the owner that belongs to the owner_id instead of just showing the id (i.e... 32). How can I display the associated name of the user from the users table based on the foreign key user_id that is referenced?

Answer 1

You need to use a JOIN to link the two tables. The example below links the two tables on owner_id and includes the user_name in the result. You will need to use an alias in the SELECT in the case that any of the column names exist in both tables.
-- use alias and include user_name
SELECT o.id, o.organization_name, u.user_id, u.user_name
-- alias the table as "o"
FROM organizations o
-- alias the table as "u"
JOIN users u
-- link the tables here on owner_id
ON o.owner_id = u.user_id
ORDER BY o.created_on DESC
You can then output the value of the user_name column in your PHP like so:
<td><?php echo e($organization['user_name']); ?></td>

Answer 2

You can use JOIN.
$organizations = $db->query("
SELECT organizations.id, organizations.organization_name,
users.user_name
FROM organizations
JOIN users ON organizations.owner_id = users.user_id
ORDER BY organizations.created_on DESC
")->fetchALL(PDO::FETCH_ASSOC);
Then in view, it can be used as
<?php foreach($organizations as $organization): ?>
<tr>
<td><?php echo e($organization['organization_name']); ?></td>
<td><?php echo e($organization['user_name']); ?></td>
</tr>
<?php endforeach; ?>