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CREATE TABLE Employees AS SELECT 'A' AS Employee, 10 AS Department UNION ALL SELECT 'A', 10 UNION ALL SELECT 'A', 11 UNION ALL SELECT 'A', 12 UNION ALL SELECT 'B', 13 UNION ALL SELECT 'B', 13
SELECT *, CASE WHEN ROW_NUMBER() OVER(PARTITION BY Employee ORDER BY Department) = 1 THEN COUNT(*) OVER (PARTITION BY Employee) END AS total_dept FROM (SELECT DISTINCT * FROM Employees) e
Employee
Department
total_dept
A
10
3
A
11
null
A
12
null
B
13
1