How to combine two rows in single rows SQL server

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SQL-Server-2008R2

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I have a table A it contains 4 columns as mentioned below

ID | SUBJECT  | MARKS1 | MARKS2 | 
1  | ENGLISH  | 10     | 20     |
2  | HINDI    | 20     | 30     |
3  | PHYSICS  | 10     | 10     |
4  | CHEMISTRY| 20     | 20     |
6  | BIOLOGY  | 10     | 10     |
7  | MATHS    | 5      | 25     |

I want to merge physics,chemistry, and biology in one row and wish to get result as

SUBJECT  | MARKS1 | MARKS2 |  TOTAL  |
ENGLISH  | 10     | 20     |  30     |
HINDI    | 20     | 30     |  50     |
SCIENCE  | 10     | 10     |  80     |
MATHS    | 5      | 25     |  30     |

Please help someone

What I have tried:

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Posted 14-Nov-19 7:58am

Member 12245539

Updated 14-Nov-19 8:24am

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ZurdoDev 14-Nov-19 14:01pm

SELECT *, (SELECT COUNT(*) FROM table WHERE subject = t1.subject) AS Total
FROM table t1

or join to a derived table
SELECT *, x.total
FROM table1 t1
INNER JOIN (
SELECT subject, COUNT(*) AS total
) x ON t1.subject = x.subject

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Richard Deeming · Accepted Answer · 2019-11-14T08:25:00

Seems simple enough - you just need a CASE statement to map the subject name, and a GROUP BY to group the rows with the same subject.

The only slightly tricky part is that you have to repeat the CASE statement in the GROUP BY clause.

SQL

SELECT
    CASE
        WHEN Subject In ('PHYSICS', 'CHEMISTRY', 'BIOLOGY') THEN 'SCIENCE'
        ELSE Subject
    END As Subject,
    Sum(Marks1) As Marks1,
    Sum(Marks2) As Marks2,
    Sum(Marks1 + Marks2) As Total
FROM
    YourTable
GROUP BY
    CASE
        WHEN Subject In ('PHYSICS', 'CHEMISTRY', 'BIOLOGY') THEN 'SCIENCE'
        ELSE Subject
    END
;