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create table tickets (
fr_id int, user_id int
);
insert into tickets values
(1, 60), (2, 50), (3, 4), (4, 60), (5, 60), (6, 60), (7, 4), (8, 60), (9, 50), (10, 50);
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<?php
$user_id = 60;
$query = "select
sum(user_id = ?) / count(*) as chance
from tickets;";
// get DB version using PDO
$stmt = $pdo->prepare($query);
$stmt->execute([$user_id]);
$row = $stmt->fetch(PDO::FETCH_ASSOC);
printf('Win chance for user %d is %s ' . PHP_EOL, $user_id, $row['chance']);
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