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SQL QuizSQL HAVING Clause
The HAVING Clause
The HAVING clause was added to SQL because the WHERE keyword could not be used with aggregate functions.
SQL HAVING Syntax
FROM table_name
WHERE column_name operator value
GROUP BY column_name
HAVING aggregate_function(column_name) operator value
SQL HAVING Example
We have the following "Orders" table:
| O_Id | OrderDate | OrderPrice | Customer |
|---|---|---|---|
| 1 | 2008/11/12 | 1000 | Hansen |
| 2 | 2008/10/23 | 1600 | Nilsen |
| 3 | 2008/09/02 | 700 | Hansen |
| 4 | 2008/09/03 | 300 | Hansen |
| 5 | 2008/08/30 | 2000 | Jensen |
| 6 | 2008/10/04 | 100 | Nilsen |
Now we want to find if any of the customers have a total order of less than 2000.
We use the following SQL statement:
GROUP BY Customer
HAVING SUM(OrderPrice)<2000
The result-set will look like this:
| Customer | SUM(OrderPrice) |
|---|---|
| Nilsen | 1700 |
Now we want to find if the customers "Hansen" or "Jensen" have a total order of more than 1500.
We add an ordinary WHERE clause to the SQL statement:
WHERE Customer='Hansen' OR Customer='Jensen'
GROUP BY Customer
HAVING SUM(OrderPrice)>1500
The result-set will look like this:
| Customer | SUM(OrderPrice) |
|---|---|
| Hansen | 2000 |
| Jensen | 2000 |
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