Query is not showing up 0 values mysql - php

Question

In my query I am listing all of the theater ticket sales and movie ticket sales of different customers. The issue I'm running into is that all of the '0' ticket sales, so those users who haven't boughten a theater ticket or movie ticket is not showing up.
Here's a picture for a visual aspect: table
I believe I need to be doing a union to return the users who haven't boughten any tickets. I just can't seem to figure this out.
Thanks in advance.
Here's my code so far:
select customer.hippcode, customer.LastName, customer.Firstname, customer.Email,
count(ticketdetails.eventtype) as 'Theater Tickets',
0 as 'Movie Tickets'
from customer
inner join ticketdetails on ticketdetails.hippcode = customer.hippcode
where ticketdetails.hippcode is not null
and ticketdetails.eventType ='T'
Group by Customer.hippcode
union
select customer.hippcode, customer.LastName, customer.Firstname, customer.Email,
0 as 'Theater Tickets', count(ticketdetails.eventtype) as 'Movie Tickets'
from customer
inner join ticketdetails on ticketdetails.hippcode = customer.hippcode
where ticketdetails.hippcode is not null
and ticketdetails.eventType ='M'
Group by Customer.hippcode
order by `theater tickets` + `movie tickets` desc;
select
customer.hippcode, customer.LastName, customer.Firstname, customer.Email,
sum(case when ticketdetails.eventtype = 'T' then 1 else 0 end) as TheaterTickets,
sum(case when ticketdetails.eventtype = 'M' then 1 else 0 end) as MovieTickets
from customer
inner join ticketdetails on ticketdetails.hippcode = customer.hippcode
where ticketdetails.hippcode is not null
and ticketdetails.eventType in ('T', 'M')
Group by customer.hippcode, customer.LastName, customer.Firstname, customer.Email
Order by 'TheaterTickets' + 'MovieTickets' desc

Answer 1

inner join => bring the line only if you got a record on both table.
I think you should use a LEFT JOIN somewhere to chose the master table
http://dev.mysql.com/doc/refman/5.7/en/join.html and
http://dev.mysql.com/doc/refman/5.7/en/left-join-optimization.html

Answer 2

I think the last query is the only one you want. A left join is appropriate, but you need to be careful about the where clause:
select c.hippcode, c.LastName, c.Firstname, c.Email,
sum(td.eventtype) as TheaterTickets,
sum(td.eventtype) as MovieTickets
from customer c left join
ticketdetails td
on td.hippcode = c.hippcode and
td.eventType in ('T', 'M')
Group by c.hippcode, c.LastName, c.Firstname, c.Email
Order by count(t.hippcode) desc;
Notes:
Table aliases make the query easier to read and write.
Conditions on ticketdetails go in the on clause, not the where clause.
The condition on td.hippcode is not null is unnecessary, because NULL will not match in the join (note: you might want to check for the customer column).
case is the standard way to do the conditional sum (and hence correct). However, MySQL offers a much simpler and intuitive syntax.
Your order by was doing nothing, because it was adding two strings (hence equivalent to order by 0. Don't use single quotes ever for column names, and you won't have a problem like that.