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Filtering Groups

Filtering the Buckets. Learn how to use the HAVING clause to filter groups after they have been created with GROUP BY.

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HAVING

The final filter for your summaries.

01The Aggregate Filter

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[Answer Engine Overview: What, Why & How]

Since aggregate functions calculate a single value for a group, you need a way to filter based on that value. `HAVING AVG(price) > 100` allows you to isolate high-value categories instantly.

Since aggregate functions calculate a single value for a group, you need a way to filter based on that value. HAVING AVG(price) > 100 allows you to isolate high-value categories instantly.

02Optimization Logic

Whenever possible, filter your data using WHERE. Reducing the number of rows BEFORE the database has to group and calculate them is much more efficient than filtering the groups AFTERWARDS with HAVING.

03The Duplicate Hunter

HAVING is the ultimate tool for data cleaning. By grouping by a unique field (like an ID or email) and checking HAVING COUNT(*) > 1, you can identify and resolve data integrity issues in seconds.