Avatar of searchsanjaysharma
searchsanjaysharma
 asked on

How to apply group by with self join for complex query.

How to apply the complex self join with group by. The data and sample output is attached.
Data-and-Desired-Output.xlsx
Microsoft SQL Server 2005

Avatar of undefined
Last Comment
searchsanjaysharma

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
Steve Wales

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
GET A PERSONALIZED SOLUTION
Ask your own question & get feedback from real experts
Find out why thousands trust the EE community with their toughest problems.
Patrick Matthews

** code changed!


This works also:

CREATE TABLE SomeTable (Course varchar(50), UID varchar(50), SubjectCode varchar(50), IM int)

INSERT INTO SomeTable (Course, UID, SubjectCode, IM) VALUES
('B.Com','12BCM1002','CMT-101',22),
('B.Com','12BCM1002','CMT-102',24),
('B.Com','12BCM1002','CMT-103',26),
('B.Com','12BCM1002','CMT-104',28),
('B.Com','12BCM1002','CMT-105',30),
('B.Com','12BCM1002','CMT-106',32),
('B.Com','12BCM1003','CMT-101',32),
('B.Com','12BCM1003','CMT-102',34),
('B.Com','12BCM1003','CMT-103',36),
('B.Com','12BCM1003','CMT-104',38),
('B.Com','12BCM1003','CMT-105',40),
('B.Com','12BCM1003','CMT-106',42),
('B.Com','12BCM1004','CMT-101',42),
('B.Com','12BCM1004','CMT-102',44),
('B.Com','12BCM1004','CMT-103',46),
('B.Com','12BCM1004','CMT-104',48),
('B.Com','12BCM1004','CMT-105',50),
('B.Com','12BCM1004','CMT-106',52),
('B.Com','12BCM1005','CMT-101',62),
('B.Com','12BCM1005','CMT-102',64),
('B.Com','12BCM1005','CMT-103',66),
('B.Com','12BCM1005','CMT-104',68),
('B.Com','12BCM1005','CMT-105',70),
('B.Com','12BCM1005','CMT-106',72),
('B.Com','12BCM1006','CMT-101',72),
('B.Com','12BCM1006','CMT-102',74),
('B.Com','12BCM1006','CMT-103',76),
('B.Com','12BCM1006','CMT-104',78),
('B.Com','12BCM1006','CMT-105',80),
('B.Com','12BCM1006','CMT-106',82)

DECLARE @sql varchar(max)

SET @sql= 'SELECT s1.Course, 
    s1.UID'

SELECT @sql = @sql + ', 
    (SELECT SUM(s2.IM) 
    FROM SomeTable s2 
    WHERE s2.Course = s1.Course AND s2.UID = s1.UID AND s2.SubjectCode = ''' + SubjectCode + ''') AS [' + SubjectCode + ']'
FROM SomeTable
GROUP BY SubjectCode
ORDER BY SubjectCode

SET @sql = @sql + ', 
    SUM(s1.IM) AS Total 
FROM SomeTable s1 
GROUP BY s1.Course, s1.UID 
ORDER BY s1.Course, s1.UID'

EXEC(@sql)

DROP TABLE SomeTable

Open in new window

searchsanjaysharma

ASKER
tx
Your help has saved me hundreds of hours of internet surfing.
fblack61