- Unions are used to combine the result-set of two or more select statements.
- The Union operation is popular for combine plan and actual values in CO-PA.
- Unions are not supported in modeled artifacts(Attribute views or analytic views) and can only be realized in calculation views.
- refrain from Joining analytical views; rather use Unions with constant values.
- Unions with constant values are supported within Graphical Calculation views and the Union operator can accept 1..N input sources.
- Whereas a script based calculation view’s comparable CE_UNION_ALL function can only accept 2 input sources at a given time.
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本文转自沧海-重庆博客园博客，原文链接：http://www.cnblogs.com/omygod/archive/2013/04/19/3031404.html，如需转载请自行联系原作者
