MySQL query for device monitoring - mysql

Question

I need your help. I try to develop monitoring of messages from devices and face some problems with SQL query. I have DB with 4 tables: devices - messages - levels - actions.
devices: id, name;
actions: id, name;
levels: id, action_id, msgcount;
messages: id, action_id, device_id;
Idea is that each devices sending messages about different actions. This messages registered in 'messages' table. Each action has different amount of levels with count of messages to get this level. I want to count registered messages and show in UI progress to next level and som additioonal info. I use following query:
select
mpd.action_id,
mpd.total,
lvl.id as lvl_id,
lvl.msgcount purpose,
lvl.name as level_name,
act.name as action
from
(select
mes.action_id,
count(1) total
from
messages mes,
devices dev
where
mes.device_id=dev.id
and dev.id=5
and mes.action_id not in(select
t.action_id
from
messages t
where
mes.device_id=t.device_id
and t.date > CURDATE())
group by
mes.action_id) mpd,
actions act,
levels lvl
where
mpd.action_id = act.id
and mpd.action_id = lvl.action_id
and lvl.msgcount = (SELECT
MIN(bad.msgcount)
FROM
levels lv
WHERE
lv.msgcount > mpd.total
and lv.action_id = mpd.action_id)
*mpd - messages pro device
But problem is that if top level already recieved this action no more shown in the list. But in this case I want to show the last recieved level(max) and total count of messages. Could someone please help me.
And also I will be very appreciated if you give some advices how to imrove my query.
devices
|------|---------|
| id | name |
|------|---------|
| 3 | RH-SW-12|
| 5 | HRS-PR |
| 6 | PRS-PR |
|------|---------|
levels
|------|-----------|----------|--------|
| id | action_id | msgcount | name |
|------|-----------|----------|--------|
| 1 | 42 | 3 | low |
| 2 | 51 | 3 | start |
| 3 | 51 | 7 | medium |
| 4 | 51 | 15 | hight |
|------|-----------|----------|--------|
actions
|------|--------------|
| id | name |
|------|--------------|
| 42 | connection |
| 51 | stop service |
|------|--------------|
messages
|------|-------------|------------|----------------|
| id | action_id | device_id | date-time |
|------|-------------|------------|----------------|
| 1 | 42 | 3 |14.09.2017 08:51|
| 2 | 42 | 5 |14.09.2017 13:08|
| 3 | 42 | 5 |14.09.2017 16:30|
| 4 | 42 | 5 |15.09.2017 07:43|
| 5 | 51 | 3 |15.09.2017 07:50|
| 6 | 51 | 3 |15.09.2017 10:22|
| 7 | 51 | 3 |15.09.2017 15:11|
| 8 | 51 | 3 |15.09.2017 18:48|
| 9 | 51 | 3 |15.09.2017 19:03|
| 10 | 51 | 5 |15.09.2017 19:18|
| 11 | 42 | 5 |15.09.2017 21:33|
|------|-------------|------------|----------------|
My query now will show following result for device 5:
|------------|---------|----------|-----------|--------------|--------------|
| action_id | total | lvl_id | purpose | level_name | action |
|------------|---------|----------|-----------|--------------|--------------|
| 51 | 1 | 2 | 3 | start | stop service |
|------------|---------|----------|-----------|--------------|--------------|
there is no info about action 42 represented because it has no more levels. Last level was "low" and it was reached.
I want modify the query to get in this case the next result for the device 5:
|------------|---------|----------|-----------|--------------|--------------|
| action_id | total | lvl_id | purpose | level_name | action |
|------------|---------|----------|-----------|--------------|--------------|
| 42 | 4 | 1 | 3 | low | connection |
| 51 | 1 | 2 | 3 | start | stop service |
|------------|---------|----------|-----------|--------------|--------------|
I hope it's possible :)

Answer 1

Try this. This will give you the current levels.
SELECT
*
FROM
devices d,
actions a,
(SELECT
device_id, action_id, COUNT(1) AS count
FROM
messages
GROUP BY device_id , action_id) m,
levels l
WHERE
d.id = m.device_id
AND a.id = m.action_id
AND l.action_id = a.id
AND m.count >= l.msgcount
AND d.id = 5;

Answer 2

Sometimes discussion with right people helps to take a look at the problem from another side. During trying different variant with answer from #HatimStovewala I found right solution:
SELECT
*
FROM
(SELECT
device_id, action_id, COUNT(1) AS count
FROM
messages
WHERE
device_id = 5
GROUP BY device_id , action_id) tmp,
levels lvl
WHERE
lvl.action_id = tmp.action_id
and lvl.msgcount = (SELECT
CASE COALESCE(MIN(msgcount),0) WHEN 0 THEN (SELECT MAX(msgcount) FROM levels WHERE action_id = tmp.action_id) ELSE MIN(repetitions) END AS rep
FROM
levels
WHERE
action_id=tmp.action_id
and msgcount >= tmp.count)
Thank you, Hatim!