MAXROW slice with conditions

AppSheet AppSheet Q&A
1

What would my formula cadence be to modify this slice formula to only include machine cleanings over 3?

[key] = MAXROW(“Machine Cleanings”, “Date”,
[Serial #] = [_ThisRow].[Serial #]
)

2

I believe I got it with

[key] = MAXROW(“Machine Cleanings”, “Date”,
And([Serial #] = [_ThisRow].[Serial #],[TDS Reading]>0
))