Aggregate Functions

  • Alex Reprintsev
Chapter

Abstract

Aggregate functions return one row for each group defined in a group by clause. Both column names and expressions can be used to define groups, and one group is a set of rows with the same values for all expressions specified in “group by.” Each row belongs to one and only one group. If “group by” is not specified, then the entire recordset is a single group, and in this case query always returns one row even if the recordset to be grouped is empty.

Copyright information

© Alex Reprintsev 2018

Authors and Affiliations

  • Alex Reprintsev
    • 1
  1. 1.LondonUK

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