SQL: HAVING Clause

The HAVING clause in SQL Server includes one or more conditions that must be TRUE for groups of records. It’s similar to the GROUP BY clause’s WHERE clause. The only distinction is that the WHERE clause cannot be used with aggregate functions, whereas the HAVING clause can.

The HAVING clause is always followed by the GROUP BY clause and preceded by the ORDER BY clause.

Syntax:

SELECT column_name, aggregate_function(column_name)
FROM table_name
GROUP BY column_name
HAVING condition;

Example:

Consider the following Employee table.

EmpId	FirstName	LastName	Salary	DeptId
1	John	King	33000	1
2	James	Bond	33000	1
3	Neena	Patel	17000	2
4	Lex	De Haan	15000	1
5	Amit	Patel	15000	1
6	Abdul	Kalam	25000	2

Query to display the departments where the sum of salaries is 50,000 or more. In this condition, we will use HAVING Clause.

SELECT DeptId,sum(Salary) as Salary
FROM Employee
GROUP BY DeptId
HAVING SUM(Salary) >= 50000; 

Output:

DeptId	Salary
1	96000

Note: also read about SQL: Group By Clause

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