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How to Use the Grouping Function

The grouping function returns a value of 1 when a grand total for groups is displayed on a group by clause with the rollup function. Otheriwse, the grouping function will return a 0. Therefore, this function allows you to distinguish a group total from a grand total for multiple groups.

To learn how to use the grouping function, follow these steps:

  1. You'll need to download and install Oracle 12c. The instructions for the setup can be found in How to use sample schemas. Follow steps 1 through 4 before proceeding to the next step.
  2. The following query uses the grouping function to display the value of the function on group total lines and on the final overall count:
    Number of employees in each department using grouping
    Note that the value of the function is 0 on group total report lines and is 1 on the final aggregate total of all groups printed at the end of the report.
Author: Stephen Withrow

Stephen has over 30 years' experience in training, development, and consulting in a variety of technology areas including Java, C, C++, XML, JavaScript, AJAX, Tomcat, JBoss, Oracle, and DB2. His background includes design and implementation of business solutions on client/server, Web, and enterprise platforms. Stephen is a published writer in both technical and non-technical endeavors. Stephen received an undergraduate degree in Computer Science and Physics from Florida State University.

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