MySQL where in list but not in temp table - mysql

Question

I am considering the following 2 tables
|------------| |-----------|
| user_roles | | roles |
|============| |===========|
| user_id | | role_id |
| role_id | | code_name |
|------------| |-----------|
I want to get all user_roles where user_id in a given list of user_ids. But I want to exclude all users who have a role with code_name = 'special_role'.
What would be the best way to do this?
For the purpose of an example, lets say I have the following:
user_roles: roles:
| user_id | role_id | | role_id | code_name |
|=========|=========| |=========|==============|
| 1 | 1 | | 1 | special_role |
| 1 | 2 | | 2 | another_role |
| 2 | 2 | |---------|--------------|
| 3 | 2 |
|---------|---------|
My thought was to use temp tables, like:
create temporary table if not exists all_user_ids as (
select ur.user_id as user_id, ur.role_id as role_id
from user_roles ur
where ur.user_id in (1,2,3)
);
create temporary table if not exists special_user_ids as (
select aui.user_id as user_id
from all_user_ids aui
join roles r on r.role_id = aui.role_id
where r.code_name = 'special_role'
);
create temporary table if not exists non_special_user_ids as (
select aui.user_id as user_id
from all_user_ids aui
where aui.user_id not in (special_user_ids.user_id)
);
Then for my final result, I could do:
select ur.user_id, ur.role_id
from user_roles ur
where ur.user_id in (non_special_user_ids.user_id)
But there's got to be a better way?!

Answer 1

You can use window functions - if you are running MySQL 8.0:
select *
from (
select ur.*, r.code_name, max(r.code_name = 'special_role') over(partition by user_id) has_special_role
from user_roles ur
inner join roles r on r.role_id = ur.role_id
) t
where has_special_role = 0
In earlier versions, one method is not exists:
select ur.*
from user_roles ur
where not exists (
select 1
from user_roles ur1
inner join roles r1 on r1.role_id = ur1.role_id
where ur1.user_id = ur.user_id and r1.code_name = 'special_role'
)

Answer 2

Just join. This should be pretty fast assuming you have keys set up.
SELECT * FROM user_roles JOIN role ON user_roles.role_id = role.role_id
WHERE user_roles.user_id IN(1,2,3 ...) AND role.code_name != "special_role"
Misunderstood the ask. If you want no users that have a special role at all:
SELECT * FROM user_roles WHERE user_id NOT IN(
SELECT user_id FROM user_roles JOIN role ON user_role.role_id = role.role_id
WHERE role.role_code = 'special_role')
AND user_id IN (1, 2, 3 ...)

Answer 3

Use IN and NOT IN for the 2 conditions:
select *
from user_roles
where user_id in (<list of usr_ids>)
and user_id not in (
select user_id from user_roles
where role_id = (select role_id from roles where code_name = 'special_role')
)
See the demo.