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WITH customers AS ( SELECT 1 AS id, 'C1' AS customer, 'A' AS Field_Name UNION ALL SELECT 2, 'C1', 'B' UNION ALL SELECT 3, 'C1', 'C' UNION ALL SELECT 4, 'C1', 'D' UNION ALL SELECT 5, 'C2', 'A' UNION ALL SELECT 6, 'C2', 'D' UNION ALL SELECT 7, 'C2', 'E' UNION ALL SELECT 9, 'C3', 'B' UNION ALL SELECT 10, 'C3', 'F' ), cte1 AS ( SELECT *, COUNT(*) OVER (PARTITION BY customer) cnt FROM customers ), cte2 AS ( SELECT *, ROW_NUMBER() OVER (PARTITION BY Field_Name ORDER BY cnt DESC) rn FROM cte1 ) SELECT id, customer, Field_Name FROM cte2 WHERE rn = 1;
id
customer
Field_Name
1
C1
A
2
C1
B
3
C1
C
4
C1
D
7
C2
E
10
C3
F