WITH medians AS (
SELECT
country,
date_id,
vaccines,
daily_vaccinations,
PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY daily_vaccinations) OVER (PARTITION BY country) AS country_median
FROM
mytable
),
filled_data AS (
SELECT
country,
date_id,
vaccines,
COALESCE(daily_vaccinations, country_median) AS daily_vaccinations
FROM
medians
)
SELECT country,
date_id,
vaccines,
ISNULL(daily_vaccinations, 0) AS filled_vaccinations
FROM filled_data;
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