[SQL] Where vs Having?

It is easy to be confused with these 2 clauses because A HAVING clause is like a WHERE clause.
⚠️WHERE clause applies to individual rows and HAVING clause applies only to groups as a whole.

A query can contain both a WHERE clause and a HAVING clause.

✔️The WHERE clause is applied first to the individual rows in the tables or table-valued objects in the Diagram pane. Only the rows that meet the conditions in the WHERE clause are grouped.

✔️The HAVING clause is then applied to the rows in the result set. Only the groups that meet the HAVING conditions appear in the query output. You can apply a HAVING clause only to columns that also appear in the GROUP BY clause or in an aggregate function.

📝As a rule of thumb, use WHERE before GROUP BY and HAVING after GROUP BY. It is a rather primitive rule, but it is useful in more than 90% of the cases.