remove duplicate on both tables v2

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Wed Apr 13 2022 07:01:08 GMT+0000 (Coordinated Universal Time)

Saved by @Bambibo9799

rollup using subquery

select p.id, points, matches_won
from
--sum the subquery first before joining
(select id, sum(matches_won)as matches_won
from matches group by id) m
on p.id = m.id

add a file to the join statement
from points_table p
join matches_group m
on p.id = m.id and p.year = m.year

  -- Update the subquery to join on a second field
    ON c.country_id = w.country_id AND w.year = CAST(c.year AS date)
    GROUP BY w.country_id) AS subquery;

-- Add the three medal fields using one sum function
SUM(COALESCE(bronze,0) + COALESCE(silver,0) + COALESCE(gold,0)) AS medals,
SUM(COALESCE(bronze,0) + COALESCE(silver,0) + COALESCE(gold,0)) / CAST(cs.pop_in_millions AS float) AS medals_per_million

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