Witryna1 kwi 2024 · Impala introduced the group by modifiers in 7.2.2: 增加了对 GROUP BY ROLLUP、CUBE 和 GROUPING SETS 的支持。 GROUP BY ROLLUP 子句为列表达式的每个组合创建一个组。 CUBE 子句为所有可能的列组合创建组。 GROUPING SETS 只是让您列出要分组的表达式组合。 这在 documentation 中解释了 GROUP BY 从该版 … Witryna12 lut 2013 · I have this query SELECT NAME, OTHER_NAME, COUNT(NAME) FROM ETHNICITY GROUP BY NAME,OTHER_NAME and I would like to add a running sum on other_name or name in that column. For instance, if the...
GROUP BY Clause - The Apache Software Foundation
WitrynaNa koniec zostawiłem wisienkę na torcie, czyli najbardziej elastyczny i chyba najczęściej wykorzystywany w praktyce sposób na wielokrotne grupowanie. Za pomocą GROUPING SETS możemy określić konkretne poziomy grupowań. ROLLUP i CUBE opisane wcześniej miały z góry narzuconą liczebność grup. W tym przypadku, możemy jawnie ... WitrynaApache Impala GROUP BY Clause Specify the GROUP BY clause in queries that use aggregation functions, such as COUNT () , SUM () , AVG () , MIN (), and MAX (). … software pf 2022
Oracle/Hive/Impala SQL比较（3-4）_impala grouping …
Witryna16 lis 2009 · grouping函数可以接受一列，返回0或者1。如果列值为空，那么grouping()返回1；如果列值非空，那么返回0。grouping只能在使用rollup或cube的查询中使用。当需要在返回空值的地方显示某个值时，grouping()就非常有用。 关于rollup和cube函数的使用，请参见我的另一篇文章。 WitrynaBasically, Impala GROUP BY Clause specifies the GROUP BY clause in queries that use aggregation functions. Like COUNT (), SUM (), AVG (), MIN (), and MAX (). Moreover, specify the names of all the columns that do not participate in the aggregation operation in the GROUP BY clause. WitrynaThe GROUPING SETS is an option of the GROUP BY clause. The GROUPING SETS defines multiple grouping sets within the same query. The following illustrates the general syntax of the GROUPING SETS option: SELECT c1, c2, aggregate (c3) FROM table GROUP BY GROUPING SETS ( (c1, c2), (c1), (c2), () ); software peta