Spark SQL 官方文档中SQL Syntax一节对Grouping Sets语句的描述如下: Groups the rows for each grouping set specified after GROUPING SETS. (... 一些举例) This clause is a shorthand for aUNION ALLwhere each leg of theUNION ALLoperator performs aggregation of each grouping set specified in theGROUPIN...
Spark SQL 官方文档中SQL Syntax一节对Grouping Sets语句的描述如下: Groups the rows for each grouping set specified after GROUPING SETS. (... 一些举例) This clause is a shorthand for aUNION ALLwhere each leg of theUNION ALLoperator performs aggregation of each grouping set specified in theGROUPIN...
Rollup Cube Grouping Set使用总结blog.51cto.com/joetang/1680382 其他两个关键字:GROUPING_ID()配合GROUPING()函数 GROUPING SETS,GROUPING__ID,CUBE,ROLLUP 这几个分析函数通常用于OLAP中,不能累加,而且需要根据不同维度上钻和下钻的指标统计,比如,分小时、天、月的UV数。 groupingset 该关键字可以实现同一...
If we omit one set of parenthesis from the above query, the meaning changes significantly and we end up separately aggregating by employee and then computing the year and month ROLLUP for all employees. The new GROUPING SETS syntax is available in all of SQL Server 2008 Community Technology ...
Spark SQL 官方文档中SQL Syntax一节对Grouping Sets语句的描述如下: Groups the rows for each grouping set specified after GROUPING SETS. (... 一些举例) This clause is a shorthand for aUNION ALLwhere each leg of theUNION ALLoperator performs aggregation of each grouping set specified in theGROUPIN...
Grouping Sets is a new feature in T-SQL in SQL Server 2008. Background People cannot help appreciating the GROUP BY clause whenever they have to get a DISTINCT from any result set. Additionally, whenever any aggregate function is required, the GROUP BY clause is the only solution. There ...
从代码本身可以看到,你只在GROUP BY GROUPING SETS子句里指定需要的分组集——其它的一切都由SQL Server搞定。指定的空括号是所谓的Empty Grouping Set,是跨整个表的聚集。当你看STATISTICS IO输出时,你会发现Sales.SalesOrderHeader只被访问了1次!这是和刚才手工实现的巨大区别。
Spark SQL 官方文档中 SQL Syntax 一节对 Grouping Sets 语句的描述如下: Groups the rows for each grouping set specified after GROUPING SETS. (... 一些举例) This clause is a shorthand for a UNION ALL where each leg of the UNION ALL operator perfor...
Spark SQL 官方文档中SQL Syntax一节对Grouping Sets语句的描述如下: Groups the rows for each grouping set specified after GROUPING SETS. (… 一些举例) This clause is a shorthand for aUNION ALLwhere each leg of theUNION ALLoperator performs aggregation of each grouping set specified in theGROUPING...
| 4 | 3 | 4 | | 2 | 2 | 3 | | 4 | 4 | 2 | | 5 | 5 | 1 | | 4 | 5 | 1 | | 3 | 1 | 1 | | 5 | 2 | 1 | | 4 | 2 | 1 | | 3 | 2 | 1 | +---+---+---+ 12 rows in set (0.00 sec) 当此条统计 SQL 加上 ROLLUP 子句后会在每个分组后面加上...