SQL - Append a count with a where has to query results - mysql

Question

I have a Laravel booking app but am currently doing some manual reporting for a client.
I have a SQL query I run in SequelPro:
SELECT t.name
, t.email
, t.trial_ends_at
,
FROM teams t
ORDER
BY t.trial_ends_at DESC
However, what I now wish to do is add another field to each row that shows the client count for that team.
The relationships for clients of a team is:
users can have many bookings,
bookings belong to a user,
bookings have a team_id field
What I wish to do is append the count of users where they have made at least 1 booking of that team id.
In Laravel's eloquent I would do:
return User::whereHas('bookings', function($q) {
$q->where('team_id', THE ID)
})->count();

Answer 1

Join to a subquery which finds the counts:
SELECT
t.name,
t.email,
t.trial_ends_at,
COALESCE(b.cnt, 0) AS client_cnt
FROM teams t
LEFT JOIN
(
SELECT team_id, COUNT(*) AS cnt
FROM bookings
GROUP BY team_id
) b
ON t.id = b.team_id -- this assumes that id joins to team_id
ORDER BY
t.trial_ends_at DESC;
You had the following requirement:
What I wish to do is append the count of users where they have made at least 1 booking of that team id.
It seems to me that a user would only appear in a record in the bookings table if there was a reservation associated with that record. In other words, I don't think we need to do any extra check for this requirement, since if a user does appear, then by default he already appeared once.

Answer 2

If your first query produce $teams then you could do something like-
foreach($teams as $team){
$userCount = User::whereHas('bookings', function($q) use($team){
$q->where('team_id', $team->id);
})->count();
if($userCount>0){
$team->userCount = $userCount;
}
}
This will append userCount if you have more then single booking in the $teams collections, otherwise not.