columns in a mysql subquery are not what is expected

Put the correlated subquery directly in the select clause:

select concat(p.lname,' ' , p.fname) as name,
    (select count(*) from openemr_postcalendar_events as e where e.pc_pid = as patient_appt
from patient_data as p
where p.financial_review_exp > '2019-07-01'

Note: don’t use single quotes for column aliases! They are meant for literal strings only. In MySQL, you can use backticks to quote identifiers – but better yet, use identifiers that do not require quoting, so you don’t have to worry about that.

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