hive 七-- hql执行顺序

书写顺序 select - from - where - group by - having - order by 执行顺序 from - where - group by - having - select - order byweb where 从右到左 过滤掉最大数量记录的条件放在末尾 group by 从左到右 须要过滤的尽可能使用where,这样就能group by 更少的数据,避免gr

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