How does medoo use SQL functions in column parameters?

{Code...} sometimes needs to look up the uid in a table like the one above, and use the count method of medoo. how can we achieve the functionality of the above statement?

Select count (distinct (uid) FROM nazou. items_want

Sometimes you need to check what is in a table like the one above.Uid, UseMedooOfCountMethod, how to implement the above statement as a function?

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Select count (distinct (uid) FROM nazou. items_want

Sometimes you need to check what is in a table like the one above.Uid, UseMedooOfCountMethod, how to implement the above statement as a function?