Incremental maintenance of aggregate and outerjoin expressions

  title={Incremental maintenance of aggregate and outerjoin expressions},
  author={Himanshu Gupta and Inderpal Singh Mumick},
  journal={Inf. Syst.},
Views stored in a data warehouse need to be kept current. As recomputing the views is very expensive, incremental maintenance algorithms are required. Over recent years, several incremental maintenance algorithms have been proposed. None of the proposed algorithms handle the general case of relational expressions involving aggregate and outerjoin operators… CONTINUE READING