题解 | #竟然没人写题解,上一道题+ where限制#
select platform, sum(click_cnt) / sum(view_cnt) as ctr from app_soc_search_view_user_day_inc where platform='app' and school_type ='985' group by platform
select platform, sum(click_cnt) / sum(view_cnt) as ctr from app_soc_search_view_user_day_inc where platform='app' and school_type ='985' group by platform
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