analytics query - days within range - oracle sql

I need count the number of previous episodes within 28 days of the current episode.

the attached has some sample data from the episodes table (fig 1). fig 2 is the desired output with the calculated field (prev_episodes)

I’d like to use an analytics function rather than an aggregate function.

thanks
ee-output2.xlsx
tonMachine100Asked:
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sdstuberCommented:
SELECT e.*,
       COUNT(
           *
       )
       OVER(
           PARTITION BY person_id
           ORDER BY dte
           RANGE INTERVAL '28' DAY PRECEDING
       ) - 1
           prev_episodes
  FROM episodes e

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instead of subtracting one to exclude the current row
you could use BETWEEN on the range

SELECT e.*,
       COUNT(
           *
       )
       OVER(
           PARTITION BY person_id
           ORDER BY dte
           RANGE BETWEEN INTERVAL '28' DAY PRECEDING AND INTERVAL '1' DAY PRECEDING
       )
           prev_episodes
  FROM episodes e

Open in new window

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tonMachine100Author Commented:
great thanks
0
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