The Question
SQL
Daily Sensor Parity Aggregation
Given a time-series dataset of sensor readings, calculate the daily aggregate sums of values partitioned by their chronological sequence. Specifically, for each day, compute the total sum of all 'odd-sequence' readings (1st, 3rd, 5th...) and 'even-sequence' readings (2nd, 4th, 6th...) based on their arrival time. The output should contain the date, the sum of odd-numbered readings, and the sum of even-numbered readings.
PostgreSQL
Window Func
CTE
FILTER Clause
Modulo Operator
Data Casting
March 23, 2026