Problem with database info on Advanced SQL Queries

Hi there,

the exercise #### Exercise 4.1 - (Optional) ask to apply a couple of functions to two different columns. Funny enough all values for those columns appears as None values (amount and payment_date)

As a result my new payment_date applying the date function or max amount are all None, and so i can just group by customer_id

Has anybody seen this issue before?

Cheers, Jose

nevermind - there was an issue with my where statement - all good!

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