The HAVING clause is used like search condition for a group or an aggregate function used in an select statement.
SQL Query
SELECT c.course_id, c.name, c.description, c.price, SUM(c.price) AS amount, COUNT(c.course_id) AS quantity FROM course c, orders o WHERE o.course_id = c.course_id GROUP BY c.course_id, c.name, c.description, c.price;
Output
COURSE_ID | NAME | DESCRIPTION | PRICE | AMOUNT | QUANTITY |
---|---|---|---|---|---|
1 | SQL 1 | SQL course for beginners | 10 | 20 | 2 |
4 | PHP | PHP course | 75 | 75 | 1 |
5 | CSS | Learn CSS | 20 | 40 | 2 |
Having example
SELECT c.course_id, c.name, c.description, c.price, SUM(c.price) AS amount, COUNT(c.course_id) AS quantity FROM course c, orders o WHERE o.course_id = c.course_id GROUP BY c.course_id, c.name, c.description, c.price HAVING COUNT(c.course_id) > 1 AND SUM(c.price) > 20;
Output
COURSE_ID | NAME | DESCRIPTION | PRICE | AMOUNT | QUANTITY |
---|---|---|---|---|---|
5 | CSS | Learn CSS | 20 | 40 | 2 |