Coalessing with condition in related table - mysql

Question

I am working in MySQL 5.7.35 and I have the following tables:
create table Table1 (
Id int not null auto_increment,
Name varchar(255) not null,
primary key(Id)
);
create table Table2 (
Id int not null auto_increment,
Name varchar(255) not null,
Table1_Id int not null,
primary key(Id),
foreign key(Table1_Id) references Table1(Id)
);
create table Table3 (
Id int not null auto_increment,
Type varchar(255) not null,
Name varchar(255) not null,
Result varchar(255) not null,
Table2_Id int not null,
primary key(Id),
foreign key(Table2_Id) references Table2(Id)
);
Inside, I have the following data:
| Id | Name |
| --- | ---------- |
| 1 | Computer A |
---
| Id | Name | Table1_Id |
| --- | ---------- | --------- |
| 1 | Test Run 1 | 1 |
---
| Id | Type | Name | Result | Table2_Id |
| --- | --------- | --------- | ------- | --------- |
| 1 | Processor | MMX | Pass | 1 |
| 2 | Processor | SSE | Pass | 1 |
| 3 | Processor | SSE 2 | Pass | 1 |
| 4 | Display | Red | Pass | 1 |
| 5 | Display | Green | Pass | 1 |
| 6 | Keyboard | General | Pass | 1 |
| 7 | Keyboard | Lights | Skipped | 1 |
| 8 | Network | Ethernet | Pass | 1 |
| 9 | Network | Wireless | Skipped | 1 |
| 10 | Network | Bluetooth | Fail | 1 |
Desired Query
I would like two columns table1_name and test_result where test_result is a concatenated string with the following logic:
For any given value in Type:
If all are passes, then the result is a Pass
If any are fails, then the result is a Fail
If any are Skipped (poviding the first two points are checked), then the result is Skipped.
So for the current data, the output will be:
| table1_name | test_result |
| ----------- | ---------------------------------------------------------------- |
| Computer A | Processor: Pass, Display: Pass, Keyboard: Skipped, Network: Fail |
Current Query
I am struggling to do the coalecing bit when the items I wish to coalesce are in a child table two levels down. My current query is:
select t1.Name as 'table1_name'
-- coalesce to happen here
from Table1 t1
inner join Table2 t2 on t1.Id = t2.Table1_Id
inner join Table3 t3 on t2.Id = t3.Table2_Id;
I have created a db-fiddle to make things easier.

Answer 1

Use GROUP_CONCAT() to collect all Results for each Name and Type combination in your preferred order and then in another level of aggregation pick the the first 1:
SELECT table1_name,
GROUP_CONCAT(Type, ': ', SUBSTRING_INDEX(Results, ',', 1) SEPARATOR ', ') test_result
FROM (
SELECT t1.Name table1_name, t3.Type,
GROUP_CONCAT(Result ORDER BY Result = 'Fail' DESC, Result = 'Skipped' DESC) Results
FROM Table1 t1
INNER JOIN Table2 t2 on t1.Id = t2.Table1_Id
INNER JOIN Table3 t3 on t2.Id = t3.Table2_Id
GROUP BY t1.Name, t3.Type
) t
GROUP BY table1_name;
If you want to preserve the order of Types in the results:
SELECT table1_name,
GROUP_CONCAT(Type, ': ', SUBSTRING_INDEX(Results, ',', 1) ORDER BY Id SEPARATOR ', ') test_result
FROM (
SELECT t1.Name table1_name, MIN(t3.Id) Id, t3.Type,
GROUP_CONCAT(Result ORDER BY Result = 'Fail' DESC, Result = 'Skipped' DESC) Results
FROM Table1 t1
INNER JOIN Table2 t2 on t1.Id = t2.Table1_Id
INNER JOIN Table3 t3 on t2.Id = t3.Table2_Id
GROUP BY t1.Name, t3.Type
) t
GROUP BY table1_name;
See the demo.

Answer 2

This looks like two levels of aggregation:
select Name, group_concat(name, ': ', result separator ', ')
from (select t1.Name, t3.type,
(case when min(result) = max(result) then min(result)
else 'Skipped'
end) as result
from Table1 t1 inner join
Table2 t2
on t1.Id = t2.Table1_Id inner join
Table3 t3
on t2.Id = t3.Table2_Id
group by t1.Name, t3.type
) nt
group by Name;