SQL ROWS BETWEEN
Defines a frame by physical row position — count actual rows, ignore whether values tie.
What & Why
ROWS BETWEEN start AND end counts physical rows, full stop. Two rows with identical values are still two separate steps in a ROWS-based frame.
See How It Works
BUSINESS QUESTION
Growth calculates a seven-observation moving average of daily active users.
| date_day | dau | new_users | returning_users |
|---|---|---|---|
| 2024-04-01 | 1240 | 180 | 1060 |
| 2024-04-02 | 1315 | 205 | 1110 |
| 2024-04-03 | 1288 | 164 | 1124 |
| 2024-04-04 | 1392 | 221 | 1171 |
EXAMPLE QUERY
SELECT
date_day,
dau,
ROUND(AVG(dau) OVER (
ORDER BY date_day
ROWS BETWEEN 6 PRECEDING AND CURRENT ROW
), 2) AS seven_row_avg
FROM growth.daily_active_users
ORDER BY date_day;RESULT — seven-row trailing average
| date_day | dau | seven_row_avg |
|---|---|---|
| 2024-04-01 | 1240 | 1240.00 |
| 2024-04-02 | 1315 | 1277.50 |
| 2024-04-03 | 1288 | 1281.00 |
| 2024-04-04 | 1392 | 1308.75 |
ROWS counts the available physical observations in each trailing frame.
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