Versuchen Sie Folgendes:http://www.sqlfiddle.com/#!2/e9372/ 1
Der Vorteil auf der DB-Seite ist, dass Sie die Abfrage nicht nur auf PHP, sondern auch auf Java, C#, Python usw. verwenden können. Und es geht schnell auf der DB-Seite
select
if(idle_state = 1,
concat('Idle ', idle_count),
concat('NonIdle ', non_idle_count) ) as Period,
startTime, endTime, duration
from
(
select
@idle_count := @idle_count + if(idle_state = 1,1,0) as idle_count,
@non_idle_count := @non_idle_count +if(idle_state = 0,1,0) as non_idle_count,
state_group, idle_state,
min(timeStamp) as startTime, max(timeStamp) as endTime,
timestampdiff(second, min(timeStamp), max(timeStamp)) as duration
from
(
select *,
@idle_state := if(rpm between 800 and 900, 1, 0) as idle_state,
@state_group := @state_group +
if(@idle_state = @prev_state,0,1) as state_group,
@prev_state := @idle_state
from (tbl, (select @state_group := 0 as y) as vars)
order by tbl.timeStamp
) as x
,(select @idle_count := 0 as y, @non_idle_count := 0 as z) as vars
group by state_group, idle_state
) as summary
Ausgabe:
| PERIOD | STARTTIME | ENDTIME | DURATION |
|-----------|----------------------------|----------------------------|----------|
| Idle 1 | May, 01 2012 01:02:56-0700 | May, 01 2012 01:05:55-0700 | 179 |
| NonIdle 1 | May, 01 2012 01:07:00-0700 | May, 01 2012 01:10:15-0700 | 195 |
| Idle 2 | May, 01 2012 01:11:20-0700 | May, 01 2012 01:14:20-0700 | 180 |
| NonIdle 2 | May, 01 2012 01:15:20-0700 | May, 01 2012 01:15:20-0700 | 0 |
Sehen Sie sich hier den Abfragefortschritt an:http://www.sqlfiddle.com/#!2 /e9372/1
Wie es funktioniert:
Fünf Schritte.
Trennen Sie zuerst den Leerlauf vom Nicht-Leerlauf:
select *,
@idle_state := if(rpm between 800 and 900, 1, 0) as idle_state
from (tbl, (select @state_group := 0 as y) as vars)
order by tbl.timeStamp;
Ausgabe:
| TIMESTAMP | RPM | Y | IDLE_STATE |
|----------------------------|------|---|------------|
| May, 01 2012 01:02:56-0700 | 802 | 0 | 1 |
| May, 01 2012 01:03:45-0700 | 845 | 0 | 1 |
| May, 01 2012 01:04:50-0700 | 825 | 0 | 1 |
| May, 01 2012 01:05:55-0700 | 810 | 0 | 1 |
| May, 01 2012 01:07:00-0700 | 1000 | 0 | 0 |
| May, 01 2012 01:08:03-0700 | 1005 | 0 | 0 |
| May, 01 2012 01:09:05-0700 | 1145 | 0 | 0 |
| May, 01 2012 01:10:15-0700 | 1110 | 0 | 0 |
| May, 01 2012 01:11:20-0700 | 800 | 0 | 1 |
| May, 01 2012 01:12:22-0700 | 812 | 0 | 1 |
| May, 01 2012 01:13:20-0700 | 820 | 0 | 1 |
| May, 01 2012 01:14:20-0700 | 820 | 0 | 1 |
| May, 01 2012 01:15:20-0700 | 1200 | 0 | 0 |
Zweitens, teilen Sie die Änderungen in Gruppen auf:
select *,
@idle_state := if(rpm between 800 and 900, 1, 0) as idle_state,
@state_group := @state_group +
if(@idle_state = @prev_state,0,1) as state_group,
@prev_state := @idle_state
from (tbl, (select @state_group := 0 as y) as vars)
order by tbl.timeStamp;
Ausgabe:
| TIMESTAMP | RPM | Y | IDLE_STATE | STATE_GROUP | @PREV_STATE := @IDLE_STATE |
|----------------------------|------|---|------------|-------------|----------------------------|
| May, 01 2012 01:02:56-0700 | 802 | 0 | 1 | 1 | 1 |
| May, 01 2012 01:03:45-0700 | 845 | 0 | 1 | 1 | 1 |
| May, 01 2012 01:04:50-0700 | 825 | 0 | 1 | 1 | 1 |
| May, 01 2012 01:05:55-0700 | 810 | 0 | 1 | 1 | 1 |
| May, 01 2012 01:07:00-0700 | 1000 | 0 | 0 | 2 | 0 |
| May, 01 2012 01:08:03-0700 | 1005 | 0 | 0 | 2 | 0 |
| May, 01 2012 01:09:05-0700 | 1145 | 0 | 0 | 2 | 0 |
| May, 01 2012 01:10:15-0700 | 1110 | 0 | 0 | 2 | 0 |
| May, 01 2012 01:11:20-0700 | 800 | 0 | 1 | 3 | 1 |
| May, 01 2012 01:12:22-0700 | 812 | 0 | 1 | 3 | 1 |
| May, 01 2012 01:13:20-0700 | 820 | 0 | 1 | 3 | 1 |
| May, 01 2012 01:14:20-0700 | 820 | 0 | 1 | 3 | 1 |
| May, 01 2012 01:15:20-0700 | 1200 | 0 | 0 | 4 | 0 |
Gruppieren Sie sie drittens und berechnen Sie die Dauer:
select
state_group, idle_state,
min(timeStamp) as startTime, max(timeStamp) as endTime,
timestampdiff(second, min(timeStamp), max(timeStamp)) as duration
from
(
select *,
@idle_state := if(rpm between 800 and 900, 1, 0) as idle_state,
@state_group := @state_group +
if(@idle_state = @prev_state,0,1) as state_group,
@prev_state := @idle_state
from (tbl, (select @state_group := 0 as y) as vars)
order by tbl.timeStamp
) as x
group by state_group, idle_state;
Ausgabe:
| STATE_GROUP | IDLE_STATE | STARTTIME | ENDTIME | DURATION |
|-------------|------------|----------------------------|----------------------------|----------|
| 1 | 1 | May, 01 2012 01:02:56-0700 | May, 01 2012 01:05:55-0700 | 179 |
| 2 | 0 | May, 01 2012 01:07:00-0700 | May, 01 2012 01:10:15-0700 | 195 |
| 3 | 1 | May, 01 2012 01:11:20-0700 | May, 01 2012 01:14:20-0700 | 180 |
| 4 | 0 | May, 01 2012 01:15:20-0700 | May, 01 2012 01:15:20-0700 | 0 |
Viertens erhalten Sie die Leerlauf- und Nicht-Leerlauf-Zählung:
select
@idle_count := @idle_count + if(idle_state = 1,1,0) as idle_count,
@non_idle_count := @non_idle_count + if(idle_state = 0,1,0) as non_idle_count,
state_group, idle_state,
min(timeStamp) as startTime, max(timeStamp) as endTime,
timestampdiff(second, min(timeStamp), max(timeStamp)) as duration
from
(
select *,
@idle_state := if(rpm between 800 and 900, 1, 0) as idle_state,
@state_group := @state_group +
if(@idle_state = @prev_state,0,1) as state_group,
@prev_state := @idle_state
from (tbl, (select @state_group := 0 as y) as vars)
order by tbl.timeStamp
) as x
,(select @idle_count := 0 as y, @non_idle_count := 0 as z) as vars
group by state_group, idle_state;
Ausgabe:
| IDLE_COUNT | NON_IDLE_COUNT | STATE_GROUP | IDLE_STATE | STARTTIME | ENDTIME | DURATION |
|------------|----------------|-------------|------------|----------------------------|----------------------------|----------|
| 1 | 0 | 1 | 1 | May, 01 2012 01:02:56-0700 | May, 01 2012 01:05:55-0700 | 179 |
| 1 | 1 | 2 | 0 | May, 01 2012 01:07:00-0700 | May, 01 2012 01:10:15-0700 | 195 |
| 2 | 1 | 3 | 1 | May, 01 2012 01:11:20-0700 | May, 01 2012 01:14:20-0700 | 180 |
| 2 | 2 | 4 | 0 | May, 01 2012 01:15:20-0700 | May, 01 2012 01:15:20-0700 | 0 |
Entfernen Sie abschließend die Staging-Variablen:
select
if(idle_state = 1,
concat('Idle ', idle_count),
concat('NonIdle ', non_idle_count) ) as Period,
startTime, endTime, duration
from
(
select
@idle_count := @idle_count + if(idle_state = 1,1,0) as idle_count,
@non_idle_count := @non_idle_count +if(idle_state = 0,1,0) as non_idle_count,
state_group, idle_state,
min(timeStamp) as startTime, max(timeStamp) as endTime,
timestampdiff(second, min(timeStamp), max(timeStamp)) as duration
from
(
select *,
@idle_state := if(rpm between 800 and 900, 1, 0) as idle_state,
@state_group := @state_group +
if(@idle_state = @prev_state,0,1) as state_group,
@prev_state := @idle_state
from (tbl, (select @state_group := 0 as y) as vars)
order by tbl.timeStamp
) as x
,(select @idle_count := 0 as y, @non_idle_count := 0 as z) as vars
group by state_group, idle_state
) as summary
Ausgabe:
| PERIOD | STARTTIME | ENDTIME | DURATION |
|-----------|----------------------------|----------------------------|----------|
| Idle 1 | May, 01 2012 01:02:56-0700 | May, 01 2012 01:05:55-0700 | 179 |
| NonIdle 1 | May, 01 2012 01:07:00-0700 | May, 01 2012 01:10:15-0700 | 195 |
| Idle 2 | May, 01 2012 01:11:20-0700 | May, 01 2012 01:14:20-0700 | 180 |
| NonIdle 2 | May, 01 2012 01:15:20-0700 | May, 01 2012 01:15:20-0700 | 0 |
Siehe Abfragefortschritt hier:http://www.sqlfiddle.com/#!2/ e9372/1
AKTUALISIEREN
Abfrage könnte verkürzt werden http://www.sqlfiddle.com/#!2/418cb /1
Wie Sie bemerken werden, kommt die Periodennummer einfach zusammen (idle-nonIdle,idle-nonIdle usw.). Sie können einfach dies tun:
select
case when idle_state then
concat('Idle ', @rn := @rn + 1)
else
concat('Non-idle ', @rn )
end as Period,
min(timeStamp) as startTime, max(timeStamp) as endTime,
timestampdiff(second, min(timeStamp), max(timeStamp)) as duration
from
(
select *,
@idle_state := if(rpm between 800 and 900, 1, 0) as idle_state,
@state_group := @state_group + if(@idle_state = @prev_state,0,1) as state_group,
@prev_state := @idle_state
from (tbl, (select @state_group := 0 as y) as vars)
order by tbl.timeStamp
) as x,
(select @rn := 0) as rx
group by state_group, idle_state
Ausgabe:
| PERIOD | STARTTIME | ENDTIME | DURATION |
|------------|----------------------------|----------------------------|----------|
| Idle 1 | May, 01 2012 01:02:56-0700 | May, 01 2012 01:05:55-0700 | 179 |
| Non-idle 1 | May, 01 2012 01:07:00-0700 | May, 01 2012 01:10:15-0700 | 195 |
| Idle 2 | May, 01 2012 01:11:20-0700 | May, 01 2012 01:14:20-0700 | 180 |
| Non-idle 2 | May, 01 2012 01:15:20-0700 | May, 01 2012 01:15:20-0700 | 0 |
