Query Condition if nothing add 0 - laravel

Question

I have a Laravel 5.7 query
$captains = DB::table('pickup_results')
->select(DB::raw("playerID"),
DB::raw("COUNT(CASE WHEN gameResult = 'Win' THEN 1 END) AS wins"),
DB::raw("COUNT(CASE WHEN gameResult = 'Loss' THEN 1 END) AS loss"))
->where('pickOrder', '=', 0)
->where('playerID', '=', $playerID)
->groupBy('playerID')
->orderBy('wins','DESC')
->get();
If the playerID doesn't have a "Win" or a "Loss" it wont add the key of wins or loss to the query results -- thus resulting in errors when a user has no wins or no loss's in the database.
I Would like to be able to default wins or loss to 0 when a value doesn't exist in the database.
Can someone help me understand how I would achieve?

Answer 1

Assuming that there isn't going to be a row in the table if the player hasn't had a win or a loss then your query isn't ever going to return any results.
One option (assuming you have a players table) would be to query the players table and then left join the pickup_results:
$captains = DB::table('players')
->leftJoin('pickup_results', 'players.id', 'pickup_results.playerID')
->select('users.id as user_id',
DB::raw("COUNT(CASE WHEN results.gameResult = 'Win' THEN 1 END) AS wins"),
DB::raw("COUNT(CASE WHEN results.gameResult = 'Lose' THEN 1 END) AS loss"))
->where('players.id', $playerID)
->where('pickup_results.pickOrder', 0)
->groupBy('players.id')
->orderBy('wins', 'DESC')
->get();
Alternatively, since you're using get() with your query a collection will be returned regardless of any results so you could chain on the whenEmpty() method instead:
$captains = DB::table('pickup_results')
->select('playerID',
DB::raw("COUNT(CASE WHEN gameResult = 'Win' THEN 1 END) AS wins"),
DB::raw("COUNT(CASE WHEN gameResult = 'Loss' THEN 1 END) AS loss"))
->where('pickOrder', 0)
->where('playerID', $playerID)
->groupBy('playerID')
->orderBy('wins', 'DESC')
->get()
->whenEmpty(function ($items) use ($playerID) {
return $items->push((object)[
'playerID' => $playerID,
'wins' => 0,
'loss' => 0,
]);
});

Answer 2

You can use SUM() instead of COUNT() and add an ELSE 0 to the query. Example for the first occurance:
DB::raw("SUM(CASE WHEN gameResult = 'Win' THEN 1 ELSE 0 END) AS wins")
Or you can use COALESCE(query, 0):
DB::raw("COALESCE(COUNT(CASE WHEN gameResult = 'Win' THEN 1 END), 0) AS wins")
This works because COUNT() returns NULL if all counted elements are NULL.

Answer 3

It will give you wins and loss in your result. Just add an else condition in your case and put an extra count condition for draw as well. Add more than 1 orderBy for better representation of results.
$captains = DB::table('pickup_results')
->select(DB::raw("playerID"),
DB::raw("SUM(CASE WHEN gameResult = 'Win' THEN 1 ELSE 0 END) AS wins"),
DB::raw("SUM(CASE WHEN gameResult = 'Loss' THEN 1 ELSE 0 END) AS loss")),
DB::raw("SUM(CASE WHEN gameResult != 'Win' and gameResult != 'Loss' THEN 1 ELSE 0 END) AS draws"))
->where('pickOrder', '=', 0)
->where('playerID', '=', $playerID)
->groupBy('playerID')
->orderBy('wins','DESC')
->orderBy('draws','DESC')
->orderBy('loss','ASC')
->get();