HAVING
CLAUSE and a WHERE CLAUSE?
The HAVING clause is a
filter that acts similar to a WHERE clause, but the filter acts on groups of
rows rather than on individual rows.
In other words, the
HAVING clause is used to qualify the results after the GROUP BY has been
applied.
The WHERE clause, in
contrast, is used to qualify the rows that are returned before the data is
aggregated or grouped.
HAVING qualifies the
aggregated data after the data has been grouped or aggregated.
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