HAVING Clause 

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.

Limitations 

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

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