July 2017
Intermediate to advanced
896 pages
23h 12m
English
Content preview from Oracle Internals
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Chapter 66
The Supporting GROUPS
Anunaya Shrivastava
Group actions are required in data processing development environments. Usually, we apply group functions on the dataset and make groups by using the GROUP BY clause. The Group functions such as AVG, SUM, COUNT, etc. do not provide all the actions that are required in the business programming environment. The Group functions also have severe restrictions in SQL because they can be used only with GROUP BY clause. However, in the data manipulations requirements/data massaging operations, we sometimes want to apply actions to groups that are not provided by the actions provided by the standard Group functions. This is especially true when a logical group records spans over many physical records. ...
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