A cross-product dashboard is a database dashboard that shows the joining of two different SQL database tables. The name comes from the term “cross product” in relational algebra, which is the basis for relational databases. A cross-product dashboard represents a cross-product graphically, in...
We’ll use a single grouping expression containing the references to the fields product_name and product_id. (Multiple grouping expressions can be used to do cube aggregations.) 最后的聚合需要两件事,而不是输入。首先是分组。我们将使用一个分组表达式,其中包含对字段product_name和product_id的引用。(...
In the above script, the two assignments of RS.A and RS.B, respectively originating from R and S work because the table RS has R and S as two upstream tables. The table tile displays the 6=2x3 lines, which result from the Cartesian product between R and S.The...