Extracting data from table with results from different search - mysql

Question

I am trying to extract data from tables with the results from a previous search. I am not really familiar with database query's and have made one that will crash my computer from drawing too much memory.
This data is coming from a board tester and I want certain information.
How many boards were ran during a given period
How many failed
All the failure data for those boards EDIT: This is the one I need to figure out. See Edit at bottom.
The first time a board is ran it creates a record in the Board table
+----------+-------+-----+
| Board_id | Board | rev |
+----------+-------+-----+
| 1 | 1234 | 1 |
| 2 | 1234 | 1 |
| 3 | 1235 | 2 |
| 4 | 5869 | 15 |
+----------+-------+-----+
Each time the board is ran it creates a Test record
+----------+----------+---------+---------------------+
| Test_id | Board_id | Operator| Date_Time |
+----------+----------+---------+---------------------+
| 34 | 1 | 1 | 2017-08-02 09:13:34 |
| 35 | 1 | 1 | 2017-08-02 09:13:36 |
| 36 | 1 | 1 | 2017-08-02 09:13:39 |
| 37 | 2 | 1 | 2017-08-02 09:14:10 |
| 38 | 3 | 1 | 2017-08-02 09:16:24 |
| 39 | 3 | 2 | 2017-08-03 10:40:45 |
| 40 | 4 | 2 | 2017-08-03 10:43:34 |
+----------+----------+---------+---------------------+
...and Results are stored in Results
+-----------+---------+--------+-------------+-------------+
| Result_id | Test_id | Result | Upper_Limit | Lower_Limit |
+-----------+---------+----------------------+-------------+
| 40 | 34 | 2 | 4 | 1 |
| 41 | 34 | 3 | 4 | 1 |
| 42 | 34 | 4 | 4 | 1 |
| 43 | 34 | 0 | 4 | 1 |
| 44 | 35 | 2 | 4 | 1 |
| 45 | 35 | 3 | 4 | 1 |
| 46 | 35 | 4 | 4 | 1 |
| 47 | 35 | 0 | 4 | 1 |
| 48 | 36 | 2 | 4 | 1 |
| 49 | 36 | 3 | 4 | 1 |
| 50 | 36 | 4 | 4 | 1 |
| 51 | 36 | 2 | 4 | 1 |
| 52 | 37 | 2 | 4 | 1 |
| 53 | 37 | 3 | 4 | 1 |
| 54 | 37 | 4 | 4 | 1 |
| 55 | 37 | 2 | 4 | 1 |
| 56 | 38 | 2 | 4 | 1 |
| 57 | 38 | 3 | 4 | 1 |
| 58 | 38 | 4 | 4 | 1 |
| 59 | 38 | 5 | 4 | 1 |
| 60 | 39 | 2 | 4 | 1 |
| 61 | 39 | 3 | 4 | 1 |
| 62 | 39 | 4 | 4 | 1 |
| 63 | 39 | 5 | 4 | 1 |
| 64 | 40 | 2 | 4 | 1 |
| 65 | 40 | 3 | 4 | 1 |
| 66 | 40 | 4 | 4 | 1 |
| 67 | 40 | 3 | 4 | 1 |
+-----------+---------+--------+-------------+-------------+
To get the number of boards, and Board_ID, ran during a given period I query.
SELECT a.Board_ID FROM
Tests a, Results b
WHERE a.Date_Time>='2017-08-02' AND a.Date_Time<'2017-08-03' and
a.Test_ID = b.Test_ID
group by a.Board_ID
To get all associated test to those Board_ID's I query.
SELECT * from
Tests x, (
SELECT a.Board_ID FROM
Tests a, Results b
WHERE a.Date_Time>='2017-08-02' AND a.Date_Time<'2017-08-03' and
a.Test_ID = b.Test_ID
group by a.Board_ID
) y
where x.Board_ID = y.Board_ID
This gives me the correct results, but the query seems off, but when I try to get the failed results from the query above is when I have the most trouble.
SELECT d.Test_ID FROM
Boards a, Tests b, (
SELECT x.Test_ID, x.Board_ID, x.Operator, x.Date_Time from
Tests x, (
SELECT a.Board_ID FROM
Tests a, Results b
WHERE a.Date_Time>='2017-08-02' AND a.Date_Time<'2017-08-03' and
a.Test_ID = b.Test_ID
group by a.Board_ID
) y
)d
WHERE d.Test_ID = b.Test_ID and
b.Result not between Lower_Limit and Upper_Limit
EDIT:
If you look at the Test table I created you will see that board_id 3 got tested twice and on two different days. I need to see the boards that we ran on a given day, this example 2017-08-02, and all associated records to those boards. So since Board_ID #3 was ran on 2 days, and was ran on the day in question, I would need that record included in my query.
My Solution
SELECT * FROM
(
SELECT x.Test_ID, x.Board_ID, x.Operator, x.Date_Time from
Test x, (
SELECT a.Board_ID FROM
Test a
join Results b on a.Test_ID = b.Test_ID
WHERE a.Date_Time>='2017-08-11' AND a.Date_Time<'2017-08-12'
group by a.Board_ID
) y
where x.Board_ID = y.Board_ID
)d
join Boards a on a.Board_ID = d.Board_ID
join Results b on b.Test_ID = d.Test_ID
join Test_Names c on c.Test_Name_ID = b.Test_Name_ID --Table Not shown
WHERE
b.result not between Lower_Limit and Upper_Limit
From this you see I have 3 nested searches into 1. With the 3 individual searches I get all the data I need to parse the information I want. Next will be to find a way to query the database for what I need instead of parsing.

Answer 1

I think you're overthinking this. You don't need all the inline views. Here's how I would write it using ANSI Joins (like #CptMisery suggested in the comments)
SELECT d.test_id, b.board, b.board_rev, r.result_id, r.result -- and whatever else you need.
from tests t
join results r on t.test_id = r.test_id
join boards b on t.board_id = b.board_id
where t.Date_Time>='2017-08-02' AND t.Date_Time<'2017-08-03'
and r.result >Lower_Limit -- or >=
and r.result < Upper_Limit -- or <=, if it can be the limit value
JOIN all the tables based on their relationships (Foreign Key to Primary Key), choose your filters in the where clause, and choose the columns to "project" with Select.

Answer 2

SELECT d.Test_ID FROM
Boards a, Tests b, ( SELECT x.Test_ID,
x.Board_ID,
x.Operator,
x.Date_Time
from Tests x,
(SELECT a.Board_ID
FROM Tests a, Results b
WHERE a.Date_Time>='2017-08-02'
AND a.Date_Time<'2017-08-03'
and a.Test_ID = b.Test_ID
group by a.Board_ID
) y
)d
WHERE d.Test_ID = d.Test_ID
and b.Result >= Lower_Limit
and b. Result <=Upper_Limit