Compressing multiple rows into single row each- the select statement to accomplish

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SQL-Server-2008R2

BRN_NAME MADD1 R1 R2 R3 R4
--------------------------------------------------------------------------
Ashanti Region 1 31 NULL NULL NULL
Ashanti Region 4 NULL NULL NULL 2
Ashanti Region 81 NULL NULL 5 NULL

Greater Accra Region 1 29 NULL NULL NULL
Greater Accra Region 4 NULL NULL NULL 2
Greater Accra Region 81 NULL 7 NULL NULL

Northern Region 1 20 NULL NULL NULL
Northern Region 81 NULL 45 NULL NULL
Northern Region 484 NULL NULL NULL 6

EXPECTED RESULT
===================

BRN_NAME R1 R2 R3 R4
----------------------------------------------------------------------------------
Ashanti Region 31 NULL 5 2

Greater Accra Region 29 7 NULL 2

Northern Region 20 45 NULL 6

Need to reduce multiple rows for each 'BRN_NAME' into a singular row.

How do you achieve it using a select statement

What I have tried:

On going system development challenge

Posted 15-May-18 6:22am

Member 12770648

Updated 15-May-18 8:04am

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Richard MacCutchan 15-May-18 12:34pm

You need to decide which fields to save from each record.

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Richard Deeming · Accepted Answer · 2018-05-15T08:05:00

SQL

SELECT
    BRN_NAME,
    Max(R1) As R1,
    Max(R2) As R2,
    Max(R3) As R3,
    Max(R4) As R4
FROM
    YourTable
GROUP BY
    BRN_NAME
;

NB: If there are multiple non-NULL values in one column for a given name, this will return the highest. If that's not what you want, then you'll need to explain how you decide which value to keep.