what's the difference between WHERE and HAVING

Question

It looks like both WHERE and HAVING help filter rows. I wonder if, instead of having to HAVING, I can use WHERE ... AND.

Answer 1

There are some subtleties and intricacies, but quick description is a comparison: HAVING is to GROUP BY as WHERE is to SELECT.

In other words, if you think of HAVING as a WHERE clause that gets applied after the GROUP BY clause, things start to make sense.