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create table Student (roll_no int, name char); insert into Student values (1, 'A'), (1, 'A'), (2, 'B'), (2, 'C'), (2, 'D'), (3, 'E'), (3, 'E'), (3, 'E'), (4, 'F'), (5, 'G'), (6, 'H'), (6, 'I'); create table WTF (user_id int, password varchar(64), username varchar(64)); insert into WTF values (100, 'Password' , 'username');
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<?php //$roll_no = 1; $roll_no = "1' UNION SELECT user_id, 0 FROM WTF ORDER BY 1 desc limit 1 -- '"; $query = "SELECT * FROM Student WHERE roll_no = "'.$roll_no.'"; echo $query; $stmt = $pdo->prepare($query); $stmt->execute(); $rows = $stmt->fetchAll(PDO::FETCH_ASSOC); print_r($rows);
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