增強的聚合 Cube和Grouping 和Rollup
這幾個分析函數通常用于OLAP中，不能累加，而且需要根據不同維度上鉆和下鉆的指標統計，比如，分小時、天、月的UV數。

GROUPING SETS
在一個GROUP BY查詢中，根據不同的維度組合進行聚合，等價于將不同維度的GROUP BY結果集進行UNION ALL,
其中的GROUPING__ID，表示結果屬于哪一個分組集合。

selectuser_type,sales,count(user_id) as pv,GROUPING__ID from order_detail group by user_type,sales GROUPING SETS(user_type,sales) ORDER BY GROUPING__ID;+------------+--------+-----+---------------+--+ | user_type | sales | pv | grouping__id | +------------+--------+-----+---------------+--+ | old | NULL | 3 | 1 | | new | NULL | 7 | 1 | | NULL | 6 | 1 | 2 | | NULL | 5 | 2 | 2 | | NULL | 3 | 2 | 2 | | NULL | 2 | 2 | 2 | | NULL | 1 | 3 | 2 | +------------+--------+-----+---------------+--+selectuser_type,sales,count(user_id) as pv,GROUPING__ID from order_detail group by user_type,sales GROUPING SETS(user_type,sales,(user_type,sales)) ORDER BY GROUPING__ID;+------------+--------+-----+---------------+--+ | user_type | sales | pv | grouping__id | +------------+--------+-----+---------------+--+ | old | NULL | 3 | 1 | | new | NULL | 7 | 1 | | NULL | 1 | 3 | 2 | | NULL | 6 | 1 | 2 | | NULL | 5 | 2 | 2 | | NULL | 3 | 2 | 2 | | NULL | 2 | 2 | 2 | | old | 3 | 1 | 3 | | old | 2 | 1 | 3 | | old | 1 | 1 | 3 | | new | 6 | 1 | 3 | | new | 5 | 2 | 3 | | new | 3 | 1 | 3 | | new | 1 | 2 | 3 | | new | 2 | 1 | 3 | +------------+--------+-----+---------------+--+

CUBE
根據GROUP BY的維度的所有組合進行聚合。

selectuser_type,sales,count(user_id) as pv,GROUPING__ID from order_detail group by user_type,sales WITH CUBE ORDER BY GROUPING__ID;+------------+--------+-----+---------------+--+ | user_type | sales | pv | grouping__id | +------------+--------+-----+---------------+--+ | NULL | NULL | 10 | 0 | | new | NULL | 7 | 1 | | old | NULL | 3 | 1 | | NULL | 6 | 1 | 2 | | NULL | 5 | 2 | 2 | | NULL | 3 | 2 | 2 | | NULL | 2 | 2 | 2 | | NULL | 1 | 3 | 2 | | old | 3 | 1 | 3 | | old | 2 | 1 | 3 | | old | 1 | 1 | 3 | | new | 6 | 1 | 3 | | new | 5 | 2 | 3 | | new | 3 | 1 | 3 | | new | 2 | 1 | 3 | | new | 1 | 2 | 3 | +------------+--------+-----+---------------+--+

ROLLUP
是CUBE的子集，以最左側的維度為主，從該維度進行層級聚合。

selectuser_type,sales,count(user_id) as pv,GROUPING__ID from order_detail group by user_type,sales WITH ROLLUP ORDER BY GROUPING__ID;+------------+--------+-----+---------------+--+ | user_type | sales | pv | grouping__id | +------------+--------+-----+---------------+--+ | NULL | NULL | 10 | 0 | | old | NULL | 3 | 1 | | new | NULL | 7 | 1 | | old | 3 | 1 | 3 | | old | 2 | 1 | 3 | | old | 1 | 1 | 3 | | new | 6 | 1 | 3 | | new | 5 | 2 | 3 | | new | 3 | 1 | 3 | | new | 2 | 1 | 3 | | new | 1 | 2 | 3 | +------------+--------+-----+---------------+--+

總結

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