[英]Get top N from sorted group with SQL
您可以在 ORDER BY 子句中將 ROW_NUMBER() 與 SUM 分析函數一起使用 -
SELECT channel, category, volume
FROM (SELECT ROW_NUMBER() OVER(PARTITION BY channel ORDER BY volume DESC) RN,
SUM(volume) OVER(PARTITION BY channel) tot_volume
channel, category, volume
FROM (SELECT channel, category, SUM(volume) volume
FROM your_table
GROUP BY channel, category
) t
) tmp
WHERE RN <= 2
ORDER BY tot_volume DESC, volume DESC;
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