Question

基本上我正在尝试从表中添加一些字段并重现另一个没有运气的表。

初始表看起来像;

ID   STATUS       Min       Max     Mean    TimeStamp   
1   Motor1-ON     10        20       15     12/01/2013 05:00 
2   Motor1-OFF     5        7         6     12/01/2013 05:00
3   Motor1- HOLD   1        3         2     12/01/2013 05:00 
4   Motor2-ON      8        12       10     12/01/2013 05:00 
5   Motor2-OFF     4        6         5     12/01/2013 05:00
6   Motor2-HOLD    1        5         3     12/01/2013 05:00

7   Motor1-ON     11       21        16     12/01/2013 05:10
8   Motor1-OFF     5        7         6     12/01/2013 05:10
9   Motor1- HOLD   1        3         2     12/01/2013 05:10
10  Motor2-ON      9       10        9.5    12/01/2013 05:10
11  Motor2-OFF     5        7         6     12/01/2013 05:10
12  Motor2-HOLD    1        5         3     12/01/2013 05:10
.     .            .        .         .           .
.     .            .        .         .           .
.     .            .        .         .           .

状态分为两种类型：电机1和电机2，时间戳每10分钟递增一次。我正在尝试基于第一个表创建一个新表，以便为每个时间戳添加Motor 1和Motor2的3个状态。我试图实现的表（到目前为止没有运气）应该看起来像;

Timestamp        Total_ON   Total_ON    Total_ON    Total_OFF    Total_OFF    Total_OFF
                    _Min      _Max        _Mean       _Min        _Max         _Mean

12/01/2013 05:00     18        32          35          9           13            11
12/01/2013 05:10     20        31         25.5         10          14            12
    .                 .             .                    .          .             . 
    .                 .             .                    .          .             .

（该表继续包含Total_Hold_Min，Total_Hold_Max，Total_Hold_Mean）

哪里

Total_ON_Min = Motor 1_ON  Min +  Motor 2_ON Min (For its given Timestamp)

Total_ON_Max = Motor1_ON Max + Motor2_OFF Max (For its given Timestamp)

Total_ON_Mean =  Motor1_ON Mean + Motor2_OFF Mean (For its given Timestamp)

等等...

任何人都可以就我应该看到的正确的mysql语句提供任何建议。我一直试图实现CrossTab没有成功。使用select语句和sum聚合函数分别计算motor1和motor 2的各个总数是没问题但是在每个时间戳中添加两个字段我没有成功

当我试图建立在我的知识基础上时，任何想法或相关链接都非常感激

我是mysql的新手

由于

其他信息：

电机状态非常独立且静态，所以我无法将其分解。如上所述，枢轴表失去了我需要的灵活性。我想出了一个基于给定想法的部分解决方案，它总共适用于Min。

SELECT

`timestamp`,

status,

SUM(Min) AS `Total_ON_MIN` FROM Tablename where Status IN('Motor1_on','Motor2_on')
FROM table

GROUP BY `timestamp`

我在使用这种方法引入'Total_Max_ON'等方面做得很差。在按时间戳分组时出现错误。

SELECT
    `timestamp`,
     status,

(SELECT SUM(Min) AS `Total_ON_MIN` FROM Tablename where Status IN('Motor1_on','Motor2_on')),

(SELECT SUM(Max) AS `Total_ON_MAX` FROM Tablename where Status IN('Motor1_on','Motor2_on')),

(SELECT SUM(Mean) AS `Total_ON_MEAN` FROM Tablename where Status IN('Motor1_on','Motor2_on'))

GROUP BY `timestamp`

任何进一步指导的想法。欢呼

Answer 1

您应该强烈考虑将电机标识符（即电机1，电机2）和状态指示灯（开/关/保持）分成两个单独的字段。

然后您可以轻松查询

SELECT
    `timestamp`,
    SUM(CASE WHEN status = 'ON' THEN Min ELSE 0 END CASE) AS `ON_Min`,
    SUM(CASE WHEN status = 'ON' THEN Max ELSE 0 END CASE) AS `ON_Max`,
    SUM(CASE WHEN status = 'ON' THEN Mean ELSE 0 END CASE) AS `ON_Mean`,
    SUM(CASE WHEN status = 'OFF' THEN Min ELSE 0 END CASE) AS `OFF_Min`,
    SUM(CASE WHEN status = 'OFF' THEN Max ELSE 0 END CASE) AS `OFF_Max`,
    SUM(CASE WHEN status = 'OFF' THEN Mean ELSE 0 END CASE) AS `OFF_Mean`
FROM table
GROUP BY `timestamp`
ORDER BY `timestamp` ASC

或者，如果你真的不需要一个支点，你可以做

SELECT
    `timestamp`,
    status,
    SUM(Min) AS `Min_Sum`,
    SUM(Max) AS `Max_Sum`,
    SUM(Mean) AS `Mean_Sum`
FROM table
GROUP BY `timestamp`, status
ORDER BY `timestamp` ASC, status ASC

或者如果您需要按电机分解

SELECT
    `timestamp`,
    motor,
    status,
    SUM(Min) AS `Min_Sum`,
    SUM(Max) AS `Max_Sum`,
    SUM(Mean) AS `Mean_Sum`
FROM table
GROUP BY `timestamp`, motor, status
ORDER BY `timestamp` ASC, motor ASC, status ASC

如果你打破电机和状态，你会发现你可以更灵活地查询。

如果您绝对无法将状态分解为电机和状态，那么我可能会执行以下操作：

SELECT
    `timestamp`,
    SUM(CASE WHEN status LIKE '%ON' THEN Min ELSE 0 END CASE) AS `ON_Min`,
    SUM(CASE WHEN status LIKE '%ON' THEN Max ELSE 0 END CASE) AS `ON_Max`,
    SUM(CASE WHEN status LIKE '%ON' THEN Mean ELSE 0 END CASE) AS `ON_Mean`,
    SUM(CASE WHEN status LIKE '%OFF' THEN Min ELSE 0 END CASE) AS `OFF_Min`,
    SUM(CASE WHEN status LIKE '%OFF' THEN Max ELSE 0 END CASE) AS `OFF_Max`,
    SUM(CASE WHEN status LIKE '%OFF' THEN Mean ELSE 0 END CASE) AS `OFF_Mean`
FROM table
GROUP BY `timestamp`
ORDER BY `timestamp` ASC

给定时间戳的列中的MYSQL求和字段

1 个答案: