This SQL article explain how to use the SQL HAVING clause with example and syntax. Mainly the SQL HAVING clause is used in combination with the GROUP BY clause to restrict the groups of returned rows to only those whose the condition is TRUE.
SELECT exp1, exp2, ... expn,
[WHERE conditions] GROUP BY exp1, exp2, ... expn
- exp1, exp2, … expn:Expressions that are not encapsulated within an aggregate function.
- aggregate_function: Aggregate functions in HTML5 are: SUM, COUNT, MIN, MAX, or AVG functions.
- aggregate_exp:This is the column or expression that the aggregate_function will be used on.
- tables:The tables that you wish to retrieve records from.
- WHERE conditions:Fetch the data from table based on conditions. These are the conditions for the records to be selected.
- HAVING condition:This is a further condition applied only to the aggregated results to restrict the groups of returned rows.
SQL HAVING Clause Example
We use HAVING Clause in SQL with different SQL aggregate functions.
1)Example – Using SUM aggregate function
In here, the HAVING clause explain with SUM aggregate functions in SQL.
SELECT name, SUM (salary)
GROUP BY name
HAVING SUM (salary) > 35000
The output like this:
2)Example – Using COUNT aggregate function
SELECT dept, COUNT(*) AS " Total Number of employees"
WHERE salary > 35000
GROUP BY dept
HAVING COUNT(*) > 10;
If anyone has doubts on this topic then please do let me know by leaving comments or send me an email.