SELECT source_id, company_id, MAX(avg_click) as max_click FROM
(SELECT source_id,company_id,AVG(clicks) AS avg_click FROM table_company
GROUP BY source_id,company_id
ORDER BY avg_click DESC) tmp
GROUP BY company_id
sql。得到一个最大值（avg（column））
sql。得到一个最大值（avg（column））
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