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Allows filtering the aggregation results produced by GROUP BY. It is similar to the WHERE clause, but the difference is that WHERE is performed before aggregation, while HAVING is performed after it. It is possible to reference aggregation results from SELECT clause in HAVING clause by their alias. Alternatively, HAVING clause can filter on results of additional aggregates that are not returned in query results.

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Example

If you have a sales table as follows: 
CREATE TABLE sales
(
    region String,
    salesperson String,
    amount Float64
)
ORDER BY (region, salesperson);
You can query it like so: 
SELECT
    region,
    salesperson,
    sum(amount) AS total_sales
FROM sales
GROUP BY
    region,
    salesperson
HAVING total_sales > 10000
ORDER BY total_sales DESC;
This will list sales people with greater than 10,000 in total sales in their region.

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Limitations

HAVING can’t be used if aggregation is not performed. Use WHERE instead.