Question

我在表中有3列，分别是Id（int），Value（int）和Time（datetime）。我想要查询获得前10分钟的数据，然后获得第2组10分钟的数据并继续...

表中的数据示例

我尝试使用此查询，但它没有显示任何内容

SELECT sensor_Id
    ,sensor_Value
    ,sensor_Timestamp
FROM TABLE
WHERE DATEDIFF(MINUTE, sensor_Timestamp, GETDATE()) <= 10

Answer 1

如果要在查询运行之前的10分钟内显示值，则查询没问题。

如果您想要一些特定的 10分钟间隔，则需要指定（通过传递该日期和时间代替between或使用SELECT sensor_Id ,sensor_Value ,sensor_Timestamp FROM TABLE where sensor_Timestamp between '2016-10-10 15:50' and '2016-10-10 16:00'开始和结束时间。

例如：

public void purchased(int qtyPurchased) throws SQLException {
    // TODO: Update the ProductsDB table's quantity for this
    // object's product code.
    try (Connection conn = SimpleDataSource.getConnection()) {
        try (PreparedStatement stat = conn.prepareStatement(
                "UPDATE ProductsDB SET Quantity = ? WHERE Product_Code = ?")) {
            stat.setInt(1, qtyPurchased);
            stat.setString(2, productCode);
            stat.execute();
        }
    }

}

Answer 2

以下查询将为您提供所需的结果

    SELECT sensor_Id, sensor_Value, CONVERT(VARCHAR(10), CONVERT(DATETIME, sensor_Timestamp, 0), 101)  + CONVERT(VARCHAR(4),CONVERT(DATETIME, sensor_Timestamp, 0), 108) as sensorTimestamp
FROM TABLE 
    group by sensor_Id, sensor_Value, sensorTimestamp

我已经截断了分钟的第二个数字，将聚合函数放在上面。

Answer 3

请尝试这个（我试图创建开始和结束日期变量，其中可分为10分钟）

declare @current_time datetime = getdate()
declare @total_minutes int = datediff(minute, 0, @current_time)
declare @add_subtract_minutes int = @total_minutes % 10
declare @start_date datetime = dateadd(minute, @total_minutes - @add_subtract_minutes, 0)
declare @end_date datetime = dateadd(minute, @total_minutes + (10 - @add_subtract_minutes), 0)

SELECT sensor_Id
    ,sensor_Value
    ,sensor_Timestamp
FROM TABLE
WHERE sensor_Timestamp between @start_date and @end_date

测试快照 -

Answer 4

这可能不是确切的解决方案，您可以尝试这样的事情：

Declare @startdatetime datetime= '2016-10-10 15:49:15.000'

Declare @executeForThisNumber int = 3 -- for 3 intervals of 10 mins after @startdatetime

While @executeForThisNumber > 0
begin
    declare @cmd varchar(max) = 'Select * from table
    Where sensor_TimeStamp > ''' + convert(varchar(40), DATEADD(mi,-10,@startdatetime), 121) + ''' AND sensor_TimeStamp <= ''' + convert(varchar(40), @startdatetime, 121) + ''''
    EXEC (@cmd)

    set @startdatetime = convert(varchar(40), DATEADD(mi,10,@startdatetime), 121)
    set @executeForThisNumber = @executeForThisNumber - 1
end

Answer 5

您在这里，这应该可以帮助您。您只需要格式化日期时间值即可截断最后一分钟的数字。

-- SET UP TEST DATA
IF OBJECT_ID('tempdb..#SensorData', 'U') IS NOT NULL DROP TABLE #SensorData;
CREATE TABLE #SensorData (sendor_ID int, sensor_Value int, sensor_Timestamp DATETIME);
INSERT #SensorData (sendor_ID, sensor_Value, sensor_Timestamp)
SELECT A.sendor_ID, A.sensor_Value, A.sensor_Timestamp
  FROM (
        SELECT * FROM #SensorData WHERE 1=2
        UNION ALL SELECT 1,  0001, '06/18/2020 01:01'
        UNION ALL SELECT 1,  0002, '06/18/2020 01:02'
        UNION ALL SELECT 1,  0003, '06/18/2020 01:03'
        UNION ALL SELECT 1,  0005, '06/18/2020 01:05'
        UNION ALL SELECT 1,  0008, '06/18/2020 01:08'
        UNION ALL SELECT 1,  1013, '06/18/2020 01:13'
        UNION ALL SELECT 1,  1016, '06/18/2020 01:16'
        UNION ALL SELECT 1,  2021, '06/18/2020 01:21'
        UNION ALL SELECT 1,  2027, '06/18/2020 01:27'
        UNION ALL SELECT 1,  3032, '06/18/2020 01:32'
        UNION ALL SELECT 1,  3036, '06/18/2020 01:36'
        UNION ALL SELECT 1,  4041, '06/18/2020 01:41'
        UNION ALL SELECT 1,  4047, '06/18/2020 01:47'
        UNION ALL SELECT 1,  5054, '06/18/2020 01:54'
        UNION ALL SELECT 1,  5059, '06/18/2020 01:59'
        UNION ALL SELECT 1, 20001, '06/18/2020 02:01'
        UNION ALL SELECT 1, 20002, '06/18/2020 02:02'
       ) A


-- SIMPLY RETURN THE DATA AND CHANGE TIMES TO 10 MINUE INTERVALS
SELECT A.sendor_ID
      ,A.sensor_Value
      ,(CONVERT(char(15), A.sensor_Timestamp, 121)+'0')
  FROM #SensorData A

-- AGGREGATE IN 10 MINUTE INTERVALS
SELECT A.sendor_ID
      ,COUNT(*) AS LogInstances
      ,SUM(A.sensor_Value) AS Total_sensor_Value
      ,(CONVERT(char(15), A.sensor_Timestamp, 121)+'0') AS sensor_Timestamp_10min_Intervals
  FROM #SensorData A
 GROUP BY A.sendor_ID
      ,(CONVERT(char(15), A.sensor_Timestamp, 121)+'0')
 ORDER BY A.sendor_ID
      ,(CONVERT(char(15), A.sensor_Timestamp, 121)+'0')

Answer 6

DATEDIFF的结果是天数（https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_datediff）

我认为你可以做类似的事情（未经测试）：

rm -rf ~/.gradle/caches/

从表中提取10分钟间隔的数据的SQL查询

6 个答案: