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create table users ( id int primary key, name varchar(64), category int ); insert into users values (1, 'John Smith', 0), (2, 'Sarrah Connor', 1), (3, 'Arthur Brown', 0), (4, 'Adam Grin', 1), (5, 'Max Spencer', 0), (6, 'Judith Garlet', 2);
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<?php $query = "SELECT category, JSON_ARRAYAGG(name) names from users GROUP BY category;"; $stmt = $pdo->prepare($query); $stmt->execute(); $rows = $stmt->fetchAll(PDO::FETCH_ASSOC); print_r($rows);
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