mysql查询获取连接3个表的计数

Question

We have 3 tables

Table ticket

id | email
---+-----------------
1  | test@gmail.com
2  | test1@gmail.com

table customer

email           | location
----------------+----------
test@gmail.com  | Area1
test!@gmail.com | Area2

table zone

location | zone
---------+--------
Area1    | South
Area2    | North

I am trying to right query to output as

Count(ticket.id) | Zone
-----------------+-----------
 1               | South
 1               | North

Please give me a good suggestion. Thanks in advance!

Answer 1

It is a simple join with group by

select count(ticket.id), Zone 
from ticket 
join customer on ticket.email=customer.email 
join zone on customer.location=zone.location
group by zone