Use of Min() and Max() with MySQL Stored Procedure - mysql

Question

I have a simple table which stores results of subject, so one user may have done few subject and they may have different marks. I want to create a stored procedure to retrieve min and max subject details for given student:
DELIMITER $$
CREATE DEFINER=`root`#`localhost`
PROCEDURE `Search_Min_Marks_For_Student`(IN Student_code SMALLINT)
BEGIN
SELECT Subject_Subject_code AS `Minimum Scored Subject`,
Subject_title AS `Subject Title`,
Min(Total_mk) AS Marks
FROM result,subject
WHERE result.Student_Student_code = Student_code AND
Subject_Subject_code=Subject_code;
END
I wrote one for minimum score and it works fine, but is there a way I can add max results to the same query?
-- Table structure for table `result`
--
DROP TABLE IF EXISTS `result`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `result` (
`Result_code` smallint(6) NOT NULL AUTO_INCREMENT,
`Student_Student_code` smallint(6) NOT NULL,
`Subject_Subject_code` smallint(6) NOT NULL,
`Practical_mk` smallint(6) NOT NULL,
`Assignment_mk` smallint(6) NOT NULL,
`Exam_mk` smallint(6) NOT NULL,
`Total_mk` smallint(6) NOT NULL,
`Grade` varchar(20) NOT NULL,
PRIMARY KEY (`Result_code`),
KEY `fk_Result_Subject1_idx` (`Subject_Subject_code`),
KEY `fk_Result_Student1_idx` (`Student_Student_code`),
CONSTRAINT `fk_Result_Student1` FOREIGN KEY (`Student_Student_code`) REFERENCES `student` (`Student_code`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_Result_Subject1` FOREIGN KEY (`Subject_Subject_code`) REFERENCES `subject` (`Subject_code`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=26 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = #saved_cs_client */;
--
-- Table structure for table `subject`
--
DROP TABLE IF EXISTS `subject`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `subject` (
`Subject_code` smallint(6) NOT NULL AUTO_INCREMENT,
`Subject_title` varchar(50) NOT NULL,
`Num_of_credits` smallint(6) NOT NULL,
`Description` varchar(100) DEFAULT NULL,
`Course_Course_code` smallint(6) NOT NULL,
`Department_Dep_code` smallint(6) NOT NULL,
PRIMARY KEY (`Subject_code`),
KEY `fk_Subject_Course1_idx` (`Course_Course_code`),
KEY `fk_Subject_Department1_idx` (`Department_Dep_code`),
CONSTRAINT `fk_Subject_Course1` FOREIGN KEY (`Course_Course_code`) REFERENCES `course` (`Course_code`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_Subject_Department1` FOREIGN KEY (`Department_Dep_code`) REFERENCES `department` (`Dep_code`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=8004 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = #saved_cs_client */;

Answer 1

You can get both using a (somewhat verbose) join, with their corresponding code and title. This query returns the best and worst subject as two separate rows;
SELECT DISTINCT s.Subject_Subject_code, s.Subject_title, r1.Total_mk
FROM result r1
LEFT JOIN result r2
ON r1.Total_mk > r2.Total_mk
AND r1.Student_Student_code = r2.Student_Student_code
LEFT JOIN result r3
ON r1.Total_mk < r3.Total_mk
AND r1.Student_Student_code = r3.Student_Student_code
JOIN Subject s
ON r1.Subject_code=s.Subject_Subject_code
WHERE (r2.Total_mk IS NULL OR r3.Total_mk IS NULL)
AND r1.Student_Student_code = 1;
What it does is basically select the rows where there exists no lower score (the r2 join) or there exists no better score (the r3 join) for the student, and join with subject to get the data to display.
An SQLfiddle to test with.