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When do you use WHERE clause and when do you use HAVING clause?

Torres

When do you use WHEREclause and when do you use HAVINGclause?

Herandez

The HAVINGclause is used when you want to specify a condition for a group function and it is written after the GROUP BY clause. The WHEREclause is used when you want to specify a condition for columns, and single row functions except group functions, and it is written before the GROUP BY clause if it is used.