Ms-access query to merge rows - sql

Question

I want a query to merge each of two rows meeting the following conditions in a large table:
Surname, Name, FatherName are duplicates
1, 2 contain "---" on one of the rows and 3, 4 contain "---" on the other row
Example data:
Surname Name FatherName Phone Mobile 1 2 3 4
Smith Alex Nick 12345 00000 xxx zzz --- ---
Smith Alex Nick 12345 00000 --- --- vvv aaa
Jone Mary John 22222 11111 sss eee --- ---
Pan Peter Peter 33333 22222 ttt uuu --- ---
Bob Nick Nick 44444 77777 --- --- ppp qqq
Mary Maria John 99999 00000 jjj kkk --- ---
Mary Maria John 99999 00000 --- --- iii ---
Expected output:
Surname Name FatherName Phone Mobile 1 2 3 4
Smith Alex Nick 12345 00000 xxx zzz vvv aaa
Jone Mary John 22222 11111 sss eee --- ---
Pan Peter Peter 33333 22222 ttt uuu --- ---
Bob Nick Nick 44444 77777 --- --- ppp qqq
Mary Maria John 99999 00000 jjj kkk iii ---

Answer 1

Try this simple query:
Select
Surname,
Name,
FatherName,
Phone,
Mobile,
Max(T.[1]) As [1],
Max(T.[2]) As [2],
Max(T.[3]) As [3],
Max(T.[4]) As [4]
From
YourTable As T
Group By
Surname,
Name,
FatherName,
Phone,
Mobile

Answer 2

This will work for your sample data.
First with a self join I get the merged rows and then with UNION ALL for the unique rows:
SELECT t1.Surname, t1.Name, t1.FatherName, t1.Phone, t1.Mobile,
t1.[1], t1.[2], t2.[3], t2.[4]
FROM tablename t1 INNER JOIN tablename t2
ON t1.Surname = t2.Surname AND t1.Name = t2.Name AND t1.FatherName = t2.FatherName
AND (
(t1.[1] <> '---' OR t1.[2] <> '---')
AND
(t1.[3] = '---' AND t1.[4] = '---')
AND
(t2.[3] <> '---' OR t2.[4] <> '---')
AND
(t2.[1] = '---' AND t2.[2] = '---')
)
UNION ALL
SELECT * FROM tablename AS t1
WHERE NOT EXISTS (
SELECT 1 FROM tablename AS t2
WHERE t1.Surname = t2.Surname AND t1.Name = t2.Name AND t1.FatherName = t2.FatherName AND t1.[1] <> t2.[1]
)