Journal of Northeastern University(Natural Science)

Journal of Northeastern University ›› 2006, Vol. 27 ›› Issue (12): 1331-1334.DOI: -

• OriginalPaper • Previous Articles     Next Articles

Aggregate operations in vague relational data model

Zhao, Fa-Xin (1); Ma, Zong-Min (1)   

  1. (1) School of Information Science and Engineering, Northeastern University, Shenyang 110004, China
  • Received:2013-06-23 Revised:2013-06-23 Online:2006-12-15 Published:2013-06-23
  • Contact: Zhao, F.-X.
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Abstract: Based on the theory of vague set, an extended vague relational data model is proposed. Then, the process of extended aggregate operation is discussed and a group of extended scalar aggregate operators for vague values are defined including count, sum, avg, max and min. According to the properties of max and min, the optimization algorithms for their preferences are developed to reduce their time complexity from O(nII) to O(n2).

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