CREATE TEMPORARY TABLE median_vaccinations AS
SELECT country,
AVG(daily_vaccinations) AS median_vaccination
FROM (
SELECT country,
daily_vaccinations,
COUNT(*) OVER (PARTITION BY country) AS total_rows,
ROW_NUMBER() OVER (PARTITION BY country ORDER BY daily_vaccinations) AS row_num
FROM country_vaccination_stats
WHERE daily_vaccinations IS NOT NULL
) t
WHERE row_num IN (total_rows / 2, total_rows / 2 + 1, 1)
GROUP BY country;
UPDATE country_vaccination_stats
SET daily_vaccinations = COALESCE((SELECT median_vaccination FROM median_vaccinations WHERE median_vaccinations.country = country_vaccination_stats.country), 0)
WHERE daily_vaccinations IS NULL;
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