首页 / MYSQL / 当值在一个范围内时,mysql分组

当值在一个范围内时,mysql分组

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了当值在一个范围内时,mysql分组，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含10417字，纯文字阅读大概需要15分钟。

内容图文

我搜索了高低,似乎无法找到有关如何处理我的查询的任何信息.如果我问一个愚蠢的问题,我会提前道歉,但我真的需要一些帮助.

我有一系列以不同间隔记录的值.数据如下所示：

 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

示例中的RPM是发动机RPM.

我需要开始和结束时间戳,而RPM在800-900范围内,因为这被认为是引擎空转.我还希望能够返回每个非空闲时段的开始和结束时间.

我想要获得的结果将是这样的：

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

我提前感谢您的帮助.

谢谢

解决方法:

试试这个：http://www.sqlfiddle.com/#!2/e9372/1

在DB端执行此操作的优点是,您不仅可以在PHP上使用查询,还可以在Java,C#,Python等上使用它.并且它在DB端快速执行

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

输出：

|    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 |

请在此处查看查询进度：http://www.sqlfiddle.com/#!2/e9372/1

这个怎么运作：

五个步骤.

首先,将空闲与非空闲分开：

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;

输出：

|                  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 |

其次,将更改分为几组：

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;

输出：

|                  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 |

第三,对它们进行分组,并计算持续时间：

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;

输出：

| 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 |

第四,获取空闲和非空闲计数：

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;

输出：

| 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 |

最后,删除暂存变量：

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

输出：

|    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 |

请在此处查看查询进度：http://www.sqlfiddle.com/#!2/e9372/1

UPDATE

查询可以缩短http://www.sqlfiddle.com/#!2/418cb/1

如果您注意到,则句点号串联(idle-nonIdle,idle-nonIdle等).你可以这样做：

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

输出：

|     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 |

内容总结

以上是互联网集市为您收集整理的当值在一个范围内时,mysql分组全部内容，希望文章能够帮你解决当值在一个范围内时,mysql分组所遇到的程序开发问题。如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容，请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端

扫描二维码推送至手机访问。

本文链接：https://qyyshop.com/info/893332.html

来源：【匿名】

【上一篇】mysql – 根据where子句忽略列【下一篇】用IE远程创建Mysql数据库的简易程序

更多 ►

【当值在一个范围内时,mysql分组】教程文章相关的互联网学习教程文章

mysql分组函数

组函数针对的是指定字段的非空值。注意：where子句中不能出现组函数！！！avg() 平均值（只能针对数值型）max() 最大值（不限制类型）min() 最小值（不限制类型）count() 计数（针对记录数目，即行数）stddev() 方差（只能针对数值型）sum() 求和（只能针对数值型）前提：person表id name dept_id salary manager_id0001 wangda 101 8500[NULL]0002 wanger 1033 000 00090003 wangsan 102 4000 00060004 w...

MySQL分组查询

1.创建表 create table score(id int,player varchar(20),position varchar(20),score float);insert into score values(1,‘哈登‘,‘guard‘,30.0),(2,‘杜兰特‘,‘vanguard‘,29.1),(3,‘詹姆斯‘,‘vanguard‘,28.3),(4,‘安东尼-戴维斯‘,‘vanguard‘,27.8),(5,‘利拉德‘,‘guard‘,27.2);2.分组SELECT 字段名1,........FROM 表名GROUP BY 字段名1......[HAVING 条件表达式]（2）对球员位置归类，显示每一位置的总分select...

mysql分组排序取最大值所在行的实现方法【代码】【图】

如下图，计划实现：按照 parent_code 分组，取组中code最大值所在的整条记录，如红色部分。（类似hive中： row_number() over(partition by)）select c.*from ( select a.*, (@i :=casewhen@key_i=parent_code then@i+1else1end) as sort_num,(@key_i:=parent_code) as tmp from my_test a, (SELECT@i :=0,@key_i:=‘‘) borderby parent_code,code desc) c where c.sort_num=1;个人理解， mysql 运行顺序： from >> where...

如何在交易数据中查询各个版本交易量前三的股票？（MySQL分组排名）【代码】【图】

SQL查询中，根据列A分组，分组后针对列B执行统计函数，是一件常用也很重要功能，如select T.a, max(T.b) from T order by T.a asc, T.b desc group by T.aselect T.a, count(T.b) from T order by T.a asc, T.b desc group by T.a一直这样写SQL，直到有一天，一个做股票的朋友（非IT人事）和我聊天，说他自己用Python整了点数据，想分析下每个版块成交量前三的股票，问我知不知道怎么用SQL查出来（这是一个分组排名取若干首级的需...

mysql分组查询时，讲多个值合并在一行显示【图】

mysql根据字段进行分组查询时，相同字段的数据，只会显示一个，如果要想让这个字段的所有数据，显示在一行里，可以在查询时用GROUP_CONTAT函数，默认数据合并以逗号，分开650) this.width=650;" src="/upload/getfiles/default/2022/11/9/20221109023911041.jpg" title="分组.PNG" />650) this.width=650;" src="/upload/getfiles/default/2022/11/9/20221109023911380.jpg" title="捕获12.PNG" />本文出自 “12104979” 博客，请务...

MySQL分组查询,前3条数据【代码】

SELECTtpn.news_id,tpn.title,tpn.news_group_id,tpn.send_date FROMt_pm_news tpn WHERE3 > (SELECTCOUNT(*)FROMt_pm_news tWHEREtpn.news_group_id = t.news_group_id AND tpn.send_date <= t.send_date) 注：时间相同可能会有误差原文：http://www.cnblogs.com/zhoucx66/p/5674234.html

MYSQL 分组合并函数

From： http://blog.csdn.net/wwwyuanliang10000/article/details/27536175MySQL中group_concat函数完整的语法如下：group_concat([DISTINCT] 要连接的字段 [Order BY ASC/DESC 排序字段] [Separator ‘分隔符‘]) 基本查询 mysql> select * from aa;+------+------+| id| name |+------+------+|1 | 10||1 | 20||1 | 20||2 | 20||3 | 200 ||3 | 500 |+------+------+6 rows in set (0.00 sec) 以id分组，把name字段的值打印在...

mysql分组查询n条记录【代码】

当业务逻辑越来越复杂时，这个查询的需求会越来越多，今天写成笔记记录下来，防止再忘记SELECT * FROM `notice` a where add_time > 1513008000 and admin_id >= 1 and admin_id <= 10 and status = 0 and 3 > (SELECT COUNT(1) FROM `notice` where add_time > 1513008000 and admin_id >= 1 and admin_id <= 10 and status = 0 and admin_id = a.admin_id and add_time > a.add_time ) ORDER BY admin_id虚拟一个业务，查询通知表...

mysql分组查询金额怎么同时查询全部总金额

mysql分组查询金额如何同时查询全部总金额？如题，可以在一个sql查询中解决吗？有group by,又要查询所有分组总金额，该怎么办？------解决方案--------------------union ------解决方案--------------------那也就没有合计的基础了 ------解决方案--------------------http://3years.org/archives/323.html

MySQL分组条件，group by order by limit 顺序【图】

having 中如果没有用聚合函数（必须sum，min），涉及到的字段名称必须在select 中有对应字段名称才可以，用到聚合函数可以不必在select中有相应字段名称的limit 2,3；2表示从第三条记录开始，3表示要查找的是三条记录。 MySQL分组条件，group by order by limit 顺序标签：mysql order by select 字段有用 image src sum 条件本文系统来源：http://www.cnblogs.com/hwgok/p/7348196.html

MySQL怎样分组查询

有一个user表，表中有两个字段分别是username和city，表中有3条条记录。username city张三北京张三上海李四北京如果只是查询张三和李四各有多少人，可以通过下面语句查询select username,city,count(*) from user group by username问：怎样查询在不同城市叫张三和李四的人各有多少个呢？我希望显示的结果是：张三共2人北京1人上海1人 ... 李四共1人北京1人上海0人 ...所以通过通过下面查询是不可行的。这会导致出现重复...

MySQL分组查询

1.创建表create table score(id int,player varchar(20),position varchar(20),score float); insert into score values(1,哈登,guard,30.0),(2,杜兰特,vanguard,29.1),(3,詹姆斯,vanguard,28.3),(4,安东尼-戴维斯,vanguard,27.8),(5,利拉德,guard,27.2);2.分组SELECT 字段名1,........FROM 表名GROUP BY 字段名1......[HAVING 条件表达式]（2）对球员位置归类，显示每一位置的总分 select position,sum(score) from score group b...

mysqlgroupby分组问题。【图】

如图，想按number字段中的数据以逗号分割后来进行分组？比如内容为12,的图中可能只有3个，为123的有1个。在线求大神（暂不考虑拆表和其它存储方式来进行分组）回复内容：如图，想按number字段中的数据以逗号分割后来进行分组？比如内容为12,的图中可能只有3个，为123的有1个。在线求大神（暂不考虑拆表和其它存储方式来进行分组） mysql有个函数：find_in_set.具体用法如下： select id from table where FIND_IN_SET('12',numb...

mysql分组查询查询每个组前面40条数据里面某个字段不能连续超过8条为空的记录，请大神指导【图】

数据结构如图：这里是分组并且查询前面40条记录了的，但是后面的条件不知道怎么下手，条件是sk_id不能有连续8条为空的

mysql分组按name分组取值最大一条，不理解啊，求解惑。

select a.* from test a where 1 > (select count(*) from test where name = a.name and val > a.val ) sql语句，按name分组显示最大的val值的字段问题：select count(*) from test where name = a.name and val > a.val 子查询查出来不是一个数值吗？那sql语句不就成了 select a.* from test a where 1 >1? 但是这个逻辑明显是错误的，那正确的逻辑是什么呢？外层和内层是如何比较的呢？感觉智商不够理解不了啊，，，，...

首页 / MYSQL / 当值在一个范围内时,mysql分组

当值在一个范围内时,mysql分组

内容导读

内容图文

内容总结

内容备注

内容手机端

【当值在一个范围内时,mysql分组】教程文章相关的互联网学习教程文章

mysql分组函数

MySQL分组查询

mysql分组排序取最大值所在行的实现方法【代码】【图】

如何在交易数据中查询各个版本交易量前三的股票？（MySQL分组排名）【代码】【图】

mysql分组查询时，讲多个值合并在一行显示【图】

MySQL分组查询,前3条数据【代码】

MYSQL 分组合并函数

mysql分组查询n条记录【代码】

mysql分组查询金额怎么同时查询全部总金额

MySQL分组条件，group by order by limit 顺序【图】

MySQL怎样分组查询

MySQL分组查询

mysqlgroupby分组问题。【图】

mysql分组查询查询每个组前面40条数据里面某个字段不能连续超过8条为空的记录，请大神指导【图】

mysql分组按name分组取值最大一条，不理解啊，求解惑。

MYSQL - 相关标签

分组 - 相关标签

MYSQL - 技术教程分类

MYSQL - 最新教程

MYSQL - 最热教程