SQL 拿最新数据

本文主要是介绍SQL 拿最新数据，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

select device_no,data_time,so2_value,co_value,no2_value,pm10_value,pm25_value,o3_1h_value,o3_8h_value,tvoc_value 
                from default.zjk_air_quality_device_hourly_data 
                where (device_no,data_time) in (select device_no,max(data_time) 
                from default.zjk_air_quality_device_hourly_data 
                where device_class in (1,2,6,8,9) group by device_no);

SELECT device_no, grid_code, device_longitude, device_latitude, calculate_time, forecast_time, forecast_count
FROM default.alg_camera_person_forecast_hourly_data
WHERE (device_no,forecast_time,calculate_time) IN (SELECT device_no,forecast_time,max(calculate_time) 
FROM default.alg_camera_person_forecast_hourly_data
WHERE forecast_time >='2021-09-05 00:00:00' AND  forecast_time <'2021-09-06 00:00:00' 
GROUP BY  device_no,forecast_time);

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