SAP HANA 表之间关联之UNION 沧海

  • 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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原文地址：https://www.cnblogs.com/omygod/p/3031404.html