简单，可复制

摘要： Group By 语法groupByClause: GROUP BY groupByExpression (, groupByExpression)*groupByExpression: expressiongroupByQuery: SELECT expression (, expression)* FROM src groupByClause?简单例子为了计算表的行数: SELECT COUNT(*) FROM table2;根据性别，计算去重用户数，可以写下面的查询 INSERT OVERWRITE TABLE pv_gender_sum SELECT pv_users.gende... 阅读全文