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Можно ли решить задачу проще, без PERCENTILE_CONT? Например, через ROW_NUMBER?

sobes.tech AI

Answer from AI

Yes, in some cases, it is possible to do without the PERCENTILE_CONT function and use ROW_NUMBER for an approximate calculation of percentiles.

The idea is to sort the data by the desired field and assign a sequential number to each row, then select the row with the number corresponding to the desired percentile.

Example for calculating the 50th percentile (median):

WITH ordered_data AS (
  SELECT value,
         ROW_NUMBER() OVER (ORDER BY value) AS rn,
         COUNT(*) OVER () AS total_count
  FROM table_name
)
SELECT value
FROM ordered_data
WHERE rn = FLOOR(0.5 * total_count) OR rn = CEIL(0.5 * total_count)
LIMIT 1;

This approach is simpler but less precise, especially for large datasets or when interpolation between values is required.

PERCENTILE_CONT, on the other hand, calculates the percentile with interpolation, providing a more accurate result.

In summary:

ROW_NUMBER is suitable for approximate percentiles and simple cases.
PERCENTILE_CONT is better for precise statistical calculations.

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