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https://blog.hujiangtao.cn/2019/01/hql%E5%B7%A5%E4%BD%9C/#more
123456789101112select count(id) sum_id from ((select distinct(id) id ,dt from dw_mdl.m_merge_103_3dwhere funid=20029and dt=20180917) ajoin (select distinct(uid) uid,dtfrom dw_mdl.m_guba_loginlogwhere
https://blog.hujiangtao.cn/2019/02/%E5%AD%A6%E4%B9%A0%E8%AE%B0%E5%BD%95001/
1234567891011hive 最大的限制 就是:hive不支持记录级别的更新, 插入,或者删除操作。但是用户可以通过查询生成新表或者将查询结果导入到文件中。同时,因为hadoop是一个面向批处理的系统,而MapReduce任务的启动过程需要消耗较长的时间,所以Hhive查询延时比较严重。hive不支持事务。hive不支持OLTP(联机事务处理)所需的关键功能,而更接近成为一个OLTP工具。
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