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Rolling Average Over 7 Days
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Rolling Average Over 7 Days

MediumSQL · PostgreSQL

Problem

Equinor's offshore operations teams use sensor data to monitor temperature trends in production equipment. Write a PostgreSQL query that calculates a seven-day rolling average for each sensor.

Requirements

  1. Exclude readings whose quality_status is not VALID or whose temperature is NULL.
  2. Aggregate valid readings to one average temperature per sensor and calendar day.
  3. Calculate a time-based rolling average covering the current day and the preceding six calendar days, partitioned by sensor.
  4. Return every sensor-day with a daily average and a rolling average, rounded to two decimal places.
  5. Sort the result by sensor_id and measured_day.

Schema

sensor_readings
ColumnTypeDescription
reading_idPKINTEGERUnique sensor reading identifier
sensor_idVARCHAR(30)Equipment sensor identifier
measured_atTIMESTAMPTZTimestamp when the reading was captured
temperature_cNUMERIC(6,2)Temperature measurement in degrees Celsius
quality_statusVARCHAR(20)Quality classification for the reading
Tablessensor_readings
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