id,name,age,city,signup_date,score
1,Alice,34,Montreal,2025-01-15,88.5
2,Bob,29,Toronto,2025-02-20,92.1
3,Carol,,Montreal,2025-03-05,75.0
4,Dan,41,Vancouver,2025-03-18,60.2
5,Eve,38,Montreal,2025-04-02,999.9
5,Eve,38,Montreal,2025-04-02,999.9
7,Grace,27,Toronto,2025-05-11,81.3
8,Heidi,52,,2025-06-30,79.8