SQL 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
SELECT column_name, aggregate_function(column_name)
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:
SELECT Customer,SUM(OrderPrice) FROM Orders
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:
SELECT Customer,SUM(OrderPrice) FROM Orders
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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