Having and Group by Clause

Having Clause:

The HAVING clause enables you to specify conditions that filter which group results appear in the final results.

The WHERE clause places conditions on the selected columns, whereas the HAVING clause places conditions on groups created by the GROUP BY clause.

Syntax:

The following is the position of the HAVING clause in a query:

SELECT FROM WHERE GROUP BY

HAVING

ORDER BY

The HAVING clause must follow the GROUP BY clause in a query and must also precedes the ORDER BY clause if used. The following is the syntax of the SELECT statement, including the HAVING clause:

SELECT column1, column2

FROM table1, table2

WHERE [conditions]

GROUP BY column1, column2

HAVING [conditions]

ORDER BY column1, column2

Group by Clause:

The SQL GROUP BY clause is used in collaboration with the SELECT statement to arrange identical data into groups.

The GROUP BY clause follows the WHERE clause in a SELECT statement and precedes the ORDER BY clause.

Syntax:

The basic syntax of GROUP BY clause is given below. The GROUP BY clause must follow the conditions in the WHERE clause and must precede the ORDER BY clause if one is used.

SELECT column1, column2

FROM table_name

WHERE [conditions]

GROUP BY column1, column2

ORDER BY column1, column2