/* Prepare the data */
DROP TABLE Exam;
CREATE TABLE Exam (
StudentID INT NOT NULL,
ExamID INT NOT NULL,
Mark INT,
IfPassed SMALLINT
)TYPE = InnoDB;
/* Insert data for testing */
INSERT INTO Exam (StudentID,ExamID,Mark,IfPassed) VALUES (1,1,55,1);
INSERT INTO Exam (StudentID,ExamID,Mark,IfPassed) VALUES (1,2,73,0);
INSERT INTO Exam (StudentID,ExamID,Mark,IfPassed) VALUES (2,3,44,1);
/* Real command */
SELECT StudentID, ExamID, Mark * IfPassed AS MarkIfPassed FROM Exam;