I have 4 mySQL tables namely Exams, Marks, Student and Subject. Sql with data is provided below. I need the output like below screenshot.
Marks is calculated from all Marks added together for the particular subject and student pair with their proper Weightage in Percentage (Exams with 0 Weightage are ignored)
I tried using the below query but the result didn’t gave the cumulative marks so need help.
SET @sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT('MAX(IF(sj.SubjectId = ''', SubjectId,''', pa.Marks, NULL)) AS ',SubjectId)
) INTO @sql
FROM Subject;
SET @sql = CONCAT('SELECT s.ID, s.StudentID, s.FirstName, s.LastName, ', @sql, '
FROM Student s
JOIN Marks AS pa
ON pa.StudentID = s.StudentID AND pa.OrganizationId = s.OrganizationId
JOIN Exams p
ON p.ExamId = pa.ExamId AND p.OrganizationId = pa.OrganizationId
JOIN Subject sj
ON p.SubjectId = sj.SubjectId AND pa.OrganizationId = sj.OrganizationId
WHERE p.Weightage > 0
GROUP BY s.ID');
PREPARE stmt FROM @sql;
EXECUTE stmt;Please help. FIDDLE LINK
CREATE TABLE `Exams` ( `ID` int(6) NOT NULL, `ExamId` varchar(20) COLLATE utf8_unicode_ci NOT NULL, `Name` varchar(50) COLLATE utf8_unicode_ci NOT NULL, `Date` datetime(6) DEFAULT NULL, `TotalMarks` int(6) NOT NULL, `SubjectId` varchar(30) COLLATE utf8_unicode_ci NOT NULL, `Weightage` int(6) NOT NULL DEFAULT '0', `OrganizationId` int(6) NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; -- -- Dumping data for table `Exams` -- INSERT INTO `Exams` (`ID`, `ExamId`, `Name`, `Date`, `TotalMarks`, `SubjectId`, `Weightage`, `OrganizationId`) VALUES (8, 'EX_0001', 'Test 1', '2020-05-30 17:15:38.000000', 50, 'SUB_0002', 0, 116), (9, 'EX_0002', 'Test 2', '2020-05-17 17:15:19.000000', 30, 'SUB_0001', 0, 116), (10, 'EX_0003', 'Test 3', '2020-05-17 17:15:51.000000', 30, 'SUB_0003', 10, 116), (11, 'EX_0004', 'Test 45', '2020-05-19 15:15:08.000000', 30, 'SUB_0001', 0, 116), (12, 'EX_0005', 'Final Exam', '2020-05-20 15:30:53.000000', 100, 'SUB_0001', 80, 116), (13, 'EX_0006', 'Terminal 3', '2020-05-20 15:30:03.000000', 50, 'SUB_0001', 10, 116); -- -------------------------------------------------------- -- -- Table structure for table `Marks` -- CREATE TABLE `Marks` ( `ID` int(11) NOT NULL, `StudentId` varchar(30) COLLATE utf8_unicode_ci NOT NULL, `ExamId` varchar(30) COLLATE utf8_unicode_ci NOT NULL, `Marks` int(6) NOT NULL, `OrganizationId` int(6) NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; -- -- Dumping data for table `Marks` -- INSERT INTO `Marks` (`ID`, `StudentId`, `ExamId`, `Marks`, `OrganizationId`) VALUES (14, 'S_100000001', 'EX_0004', 30, 116), (15, 'S_100000001', 'EX_0003', 25, 116), (16, 'S_100000001', 'EX_0002', 77, 116), (17, 'S_100000003', 'EX_0003', 15, 116), (18, 'S_100000003', 'EX_0004', 12, 116), (19, 'S_100000003', 'EX_0001', 12, 116), (20, 'S_100000002', 'EX_0004', 20, 116), (21, 'S_100000002', 'EX_0003', 21, 116), (22, 'S_100000001', 'EX_0005', 80, 116), (23, 'S_100000002', 'EX_0005', 90, 116); -- -------------------------------------------------------- -- -- Table structure for table `Student` -- CREATE TABLE `Student` ( `ID` int(6) NOT NULL, `GradeId` varchar(10) COLLATE utf8_unicode_ci DEFAULT NULL, `StudentID` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `OrganizationId` int(6) DEFAULT NULL, `FirstName` varchar(30) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL, `LastName` varchar(30) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL, `FatherFirstName` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `FatherLastName` varchar(30) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL, `DateOfBirth` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `PlaceOfBirth` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `Sex` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `Carnet` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `MobilePhone` bigint(8) DEFAULT NULL, `Address` varchar(60) COLLATE utf8_unicode_ci DEFAULT NULL, `MotherFirstName` varchar(30) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL, `MotherLastName` varchar(30) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL, `FatherMobilePhone` bigint(8) DEFAULT NULL, `MotherMobilePhone` bigint(8) DEFAULT NULL, `FatherProfession` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `MotherProfession` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `Observations` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; -- -- Dumping data for table `Student` -- INSERT INTO `Student` (`ID`, `GradeId`, `StudentID`, `OrganizationId`, `FirstName`, `LastName`, `FatherFirstName`, `FatherLastName`, `DateOfBirth`, `PlaceOfBirth`, `Sex`, `Carnet`, `MobilePhone`, `Address`, `MotherFirstName`, `MotherLastName`, `FatherMobilePhone`, `MotherMobilePhone`, `FatherProfession`, `MotherProfession`, `Observations`) VALUES (21, 'G_016', 'S_100000001', 116, 'Student', 'One', '', '', '', '', 'male', NULL, 8178109047, '', '', '', 0, 0, NULL, NULL, NULL), (22, 'G_016', 'S_100000002', 116, 'Student', 'two', '', '', '', '', 'female', NULL, 0, '', '', '', 0, 0, NULL, NULL, NULL), (23, 'G_002', 'S_100000003', 116, 'Student3', 'three', NULL, NULL, NULL, NULL, 'male', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL); -- -------------------------------------------------------- -- -- Table structure for table `Subject` -- CREATE TABLE `Subject` ( `ID` int(6) NOT NULL, `SubjectId` varchar(20) COLLATE utf8_unicode_ci NOT NULL, `Name` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `Abbreviation` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL, `GradeId` varchar(10) COLLATE utf8_unicode_ci NOT NULL, `OrganizationId` int(6) NOT NULL, `StaffId` varchar(30) COLLATE utf8_unicode_ci NOT NULL DEFAULT '0' ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; -- -- Dumping data for table `Subject` -- INSERT INTO `Subject` (`ID`, `SubjectId`, `Name`, `Abbreviation`, `GradeId`, `OrganizationId`, `StaffId`) VALUES (12, 'SUB_0001', 'English 1A', 'Eng_1A', 'G_016', 116, 'E_100000030'), (13, 'SUB_0002', 'English 1B', 'Eng_1B', 'G_002', 116, '0'), (14, 'SUB_0003', 'Science 1A', 'Sci_1A', 'G_016', 116, 'E_100000030');
Answers:
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Method 1
Ok with your last comment, your query would look like this
SET @sql = NULL; SELECT GROUP_CONCAT(DISTINCT CONCAT('SUM(IF(sj.SubjectId = ''', SubjectId,''', ROUND((pa.`Marks` * p.`Weightage` / 100),1),0)) AS ',SubjectId) ) INTO @sql FROM Subject; SET @sql = CONCAT('SELECT s.ID, s.StudentID, s.FirstName, s.LastName, ', @sql, ' FROM Student s JOIN Marks AS pa ON pa.StudentID = s.StudentID AND pa.OrganizationId = s.OrganizationId JOIN Exams p ON p.ExamId = pa.ExamId AND p.OrganizationId = pa.OrganizationId JOIN Subject sj ON p.SubjectId = sj.SubjectId AND pa.OrganizationId = sj.OrganizationId WHERE p.Weightage > 0 GROUP BY s.ID ORDER BY s.ID'); #SELECT @sql; PREPARE stmt FROM @sql; EXECUTE stmt;ID | StudentID | FirstName | LastName | SUB_0001 | SUB_0002 | SUB_0003 -: | :---------- | :-------- | :------- | -------: | -------: | -------: 21 | S_100000001 | Student | One | 71.7 | 0.0 | 2.5 22 | S_100000002 | Student | two | 72.0 | 0.0 | 2.1 23 | S_100000003 | Student3 | three | 0.0 | 1.2 | 1.5
db<>fiddle here
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