sqlserver计算x,y,z坐标5天的移动速度 时间字段是 StarTiime
时间: 2024-03-22 18:42:53 浏览: 53
假设你的表名为 T_BMWY_ResolveDeviceData,包含 X、Y、Z 坐标和 StartTime 时间字段,可以使用以下 SQL 语句计算 5 天内每个设备的平均移动速度:
```
SELECT DeviceId, AVG(distance / time_diff) AS avg_speed
FROM (
SELECT DeviceId,
DATEDIFF(second, LAG(StartTime) OVER (PARTITION BY DeviceId ORDER BY StartTime), StartTime) AS time_diff,
SQRT(POWER(X - LAG(X) OVER (PARTITION BY DeviceId ORDER BY StartTime), 2) +
POWER(Y - LAG(Y) OVER (PARTITION BY DeviceId ORDER BY StartTime), 2) +
POWER(Z - LAG(Z) OVER (PARTITION BY DeviceId ORDER BY StartTime), 2)) AS distance
FROM T_BMWY_ResolveDeviceData
WHERE StartTime >= DATEADD(day, -5, GETDATE())
) t
WHERE time_diff > 0
GROUP BY DeviceId
```
其中,LAG 函数用于获取上一行的 StartTime 值,计算 time_diff(两次定位之间的时间差),distance(两次定位之间的距离),最终使用 AVG 函数计算平均速度。请根据实际情况修改表名和列名。
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