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Don Burleson Blog 







Oracle Having Clause Tips

Oracle Database Tips by Donald Burleson

The Oracle HAVING clause is used in conjunction with the Oracle GROUP BY clause to limit the returned rows after the grouping.

SQL statements can utilize both a WHERE clause and an Oracle HAVING clause.  The WHERE clause will filter rows as they are selected from the table, and before grouping, the Oracle HAVING clause will filter rows after the grouping.

An example of the Oracle HAVING clause can be seen below:


The Oracle HAVING clause can be used with other functions such as COUNT, MIN, and MAX as well.

The Oracle HAVING clause is a great asset when it comes to grouping related rows.

For more information about the Oracle HAVING clause see the following links:

Oracle - Grouping Related Rows

Oracle - Truncate: A One-Way Trip






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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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