Hi folks,
I am trying to compile a query that does statistics on appointments
based on specific criteria. Here is my starting query:
SELECT
u.user_id,
c.client_id,
c.first_name,
c.last_name,
a.time_start AS stime,
FROM_UNIXTIME(a.time_start,'%Y-%m-%d') AS formatted
FROM tl_appt a
LEFT JOIN tl_users u ON a.user_id = u.user_id
LEFT JOIN tl_clients c ON a.client_id = c.client_id
LEFT JOIN tl_rooms r on a.room_id = r.room_id
WHERE a.appt_id IS NOT NULL AND FROM_UNIXTIME(a.time_start,'%Y-%m-
%d') between '2011-05-01' and '2011-12-31' and r.location_id = '2' and
a.user_id IN (14) ORDER BY u.last_name, u.first_name, c.last_name,
c.first_name
This will return a set of rows where a client may have MORE THEN ONE
appointment. From this set I need to narrow more:
1) Only display the first appointment PER Client. (there will be no
duplicate client_id)
Then once I have that set of rows established, I need to query for two
more result:
1) Show New Customers = those where the COUNT of appointments (in the
entire tl_appt table) LESS THAN the stime = 0
2) Show FORMER Customers = those where the COUNT of appointments (in
the entire tl_appt table) LESS THAN the stime > 0
I am sure I need a multiple select query, but I am having a hard time
wrapping my head around it.
Thanks for any feedback.
Don
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