Get only rows with max value having 5 tables - mysql

Question

I have this query:
SELECT work_orders.id,work_orders.create_datetime,work_orders.location,
work_orders.description,user_accounts.function as function,
user_accounts.name as username,work_order_states.name as state,
work_orders_history.state_id,max(work_order_states.id)
FROM `work_orders`
LEFT JOIN work_orders_history
on work_orders.id = work_orders_history.work_order_id
LEFT JOIN user_accounts
on work_orders.create_user_id = user_accounts.id
LEFT JOIN work_order_type
on work_orders_history.type_id = work_order_type.id
LEFT JOIN work_order_states
on work_orders_history.state_id = work_order_states.id
... and the result is this:
But what i want is only get the rows with max state_id.
I already tried various queries, but this is the best result I can get.
EDIT: Since it's more than 65k results it's hard to provide a fiddle. The desireable result is like this image:
Thanks in advance.

Answer 1

You appear to be very close in your query. You need to add a GROUP BY and take away one of your select columns.
SELECT work_orders.id,work_orders.create_datetime,work_orders.location,
work_orders.description,user_accounts.[function] as [function],
user_accounts.name as username,work_order_states.name as state,
max(work_order_states.id)
FROM `work_orders`
LEFT JOIN work_orders_history
on work_orders.id = work_orders_history.work_order_id
LEFT JOIN user_accounts
on work_orders.create_user_id = user_accounts.id
LEFT JOIN work_order_type
on work_orders_history.type_id = work_order_type.id
LEFT JOIN work_order_states
on work_orders_history.state_id = work_order_states.id
GROUP BY work_orders.id,work_orders.create_datetime,work_orders.location,
work_orders.description,user_accounts.function,
user_accounts.name,work_order_states.name
HAVING work_orders_states.ID = (SELECT MAX(state_id) FROM work_orders_history)

Answer 2

I think what you are looking for is the HAVING and GROUP BY clause combined..
SELECT work_orders.id,work_orders.create_datetime,work_orders.location,
work_orders.description,user_accounts.function as function,
user_accounts.name as username,work_order_states.name as state,
work_orders_history.state_id,max(work_order_states.id)
FROM `work_orders`
LEFT JOIN work_orders_history
on work_orders.id = work_orders_history.work_order_id
LEFT JOIN user_accounts
on work_orders.create_user_id = user_accounts.id
LEFT JOIN work_order_type
on work_orders_history.type_id = work_order_type.id
LEFT JOIN work_order_states
on work_orders_history.state_id = work_order_states.id
GROUP BY work_orders.id,work_orders.create_datetime,work_orders.location,
work_orders.description,user_accounts.function,
user_accounts.name,work_order_states.name,
work_orders_history.state_id
HAVING work_orders_history.state_id=max(work_order_states.id)