what is difference between where clause and having clause?
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Answer Posted / anant chavda
Þ The WHERE clause excludes rows that do not meet its
search conditions
Þ The GROUP BY clause collects rows that met the WHERE
clause search conditions and places those rows into a group
for each unique value in the GROUP BY clause. Omitting the
GROUP BY clause creates a single group for the whole table.
Þ The HAVING clause excludes groups that do not meet
its conditions. For example: When a query includes a GROUP
BY clause, the HAVING clause excludes groups from the
results. A SELECT statement containing a HAVING clause
without a GROUP BY clause will process the result as one
whole set. Aggregate functions specified in the select_list
calculate summary values for each surviving group.
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