customer_id,age,salary,gender,purchases,region,joined_date
1,25,45000.0,M,5,North,2020-01-15
2,30,,F,3,South,2019-03-22
3,,55000.0,M,8,,2021-07-08
4,22,32000.0,,2,East,2018-11-30
5,45,,F,12,West,2022-02-14
6,28,48000.0,M,,North,2020-06-19
7,,62000.0,F,7,South,2019-09-05
8,33,,M,4,,2021-12-01
9,41,71000.0,,9,East,2017-04-17
10,29,38000.0,F,6,West,2023-01-10