3

高低を検索しましたが、クエリの処理方法に関する情報が見つからないようです。ばかげた質問をしている場合は事前にお詫び申し上げますが、本当に助けが必要です。

さまざまな間隔で記録された一連の値があります。データは次のようになります。

 timeStamp           | RPM 
 2012-05-01 01:02:56 | 802
 2012-05-01 01:03:45 | 845
 2012-05-01 01:04:50 | 825
 2012-05-01 01:05:55 | 810
 2012-05-01 01:07:00 | 1000
 2012-05-01 01:08:03 | 1005
 2012-05-01 01:09:05 | 1145
 2012-05-01 01:10:15 | 1110
 2012-05-01 01:11:20 | 800
 2012-05-01 01:12:22 | 812
 2012-05-01 01:13:20 | 820
 2012-05-01 01:14:20 | 820
 2012-05-01 01:15:20 | 1200

例の RPM はエンジン RPM です。

エンジンのアイドリングと見なされるため、RPM が 800 ～ 900 の範囲内にある間の開始と終了のタイムスタンプが必要です。また、非アイドリング期間ごとに開始時刻と終了時刻を返せるようにしたいと考えています。

私が取得しようとしている結果は次のようになります。

Period    | startTime           | endTime             | duration 
 Idle1    | 2012-05-01 01:02:56 | 2012-05-01 01:05:55 | 179 seconds 
 nonIdle1 | 2012-05-01 01:07:00 | 2012-05-01 01:10:15 | 195 seconds 
 idle2    | 2012-05-01 01:11:20 | 2012-05-01 01:14:20 | 180 seconds

よろしくお願いします。

ありがとうございました

4

2 に答える 2

5

これを試してください：http://www.sqlfiddle.com/#!2/e9372/1

DB 側で実行する利点は、クエリを PHP だけでなく、Java、C#、Python などでも使用できることです。DB 側で実行するのは高速です。

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

出力：

|    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 |

ここでクエリの進行状況を確認してください: http://www.sqlfiddle.com/#!2/e9372/1

使い方：

5 つのステップ。

まず、アイドル状態と非アイドル状態を分離します。

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;

出力：

|                  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 |

次に、変更をグループに分けます。

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;

出力：

|                  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 |

3 番目に、それらをグループ化し、期間を計算します。

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;

出力：

| 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 |

4 番目に、アイドル カウントと非アイドル カウントを取得します。

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;

出力：

| 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 |

最後に、ステージング変数を削除します。

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

出力：

|    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 |

ここでクエリの進行状況を参照してください: http://www.sqlfiddle.com/#!2/e9372/1

アップデート

クエリを短縮できますhttp://www.sqlfiddle.com/#!2/418cb/1

お気付きかもしれませんが、期間番号はタンデムになっています (idle-nonIdle、idle-nonIdle など)。これを行うことができます：

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

出力：

|     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 |
于 2012-06-01T01:12:14.697 に答える
1

これは、ウィンドウをサポートするすべての RDBMS で機能します。http://www.sqlfiddle.com/#!1/320e4/1

時間抽出は RDBMS ごとに異なりますが、

with a as
(
  select *, (rpm between 800 and 900) as idle_state,
        case when 
            (rpm between 800 and 900) =
            (lag(rpm) over(order by timestamp) between 800 and 900) then 0
        else 
            1
        end as detect_leader
  from tbl   
)
,grp as
(
  select *, sum(detect_leader) over(order by timeStamp) as state_group
  from a
)
,rn as 
(
  select state_group, idle_state,

    min(timeStamp) as startTime, max(timeStamp) as endTime,  
    extract(epoch from ( max(timeStamp) - min(timeStamp) ) ) as duration

  from grp
  group by state_group, idle_state
  order by state_group
)
select 
   case when idle_state then 'Idle ' else 'Non-idle ' end 
      || (row_number() over(order by state_group) + 1) / 2  as Period,

   rn.startTime, rn.endTime, rn.duration
from rn;

出力：

|     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 |

ここでクエリの進行状況を参照してください: http://www.sqlfiddle.com/#!1/320e4/1

于 2012-06-01T04:04:39.793 に答える