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Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts
book

Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts

by John Adolph Palinski
August 2002
Intermediate to advanced content levelIntermediate to advanced
528 pages
10h 12m
English
Addison-Wesley Professional
Content preview from Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts

Limiting Selected Records by Using a Group Function

The last SELECT statement clause to be discussed is the HAVING clause. This clause is similar to the WHERE clause in that it determines whether the record is eligible for selection. The clause contains arguments used to evaluate records. Multiple conditions can be placed in the HAVING clause. The AND and OR keywords can also be used within the clause to develop complex logic.

The difference between the HAVING clause and the WHERE clause is that one of the arguments in a HAVING clause condition must be a group function. The HAVING clause is used only when a grouped value is computed by the SELECT statement. This requires a group function to exist in the SELECT clause. Listing 5.15 illustrates ...

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Publisher Resources

ISBN: 0201752948Purchase book