SQL HAVING

HAVING is like WHERE but operates on grouped records.

HAVING requires that a GROUP BY clause is present.

Groups that meet the HAVING criteria will be returned.

HAVING is used with aggregrates: COUNT, MAX, SUM, etc.

Example

#

List all countries with more than 2 suppliers.

SELECT Country, COUNT(Id) AS Suppliers
  FROM Supplier
 GROUP BY Country
HAVING COUNT(Id) > 2
Result:  3 records
Country Suppliers
France 3
Germany 3
USA 4

Syntax

HAVING syntax.

SELECT column-names
  FROM table-name
 WHERE condition
 GROUP BY column-names
HAVING condition

HAVING syntax with ORDER BY.

SELECT column-names
  FROM table-name
 WHERE condition
 GROUP BY column-names
HAVING condition
 ORDER BY column-names

More Examples

HAVING with COUNT

CUSTOMER
Id
FirstName
LastName
City
Country
Phone
Problem: List the number of customers in each country. Only include countries with more than 10 customers.
SELECT Country, COUNT(Id) AS Customers
  FROM Customer
 GROUP BY Country
HAVING COUNT(Id) > 10
Result:  3 records
Country Customers
France 11
Germany 11
USA 13

HAVING and ORDER BY

CUSTOMER
Id
FirstName
LastName
City
Country
Phone
Problem: List the number of customers in each country, except the USA, sorted high to low. Only include countries with 9 or more customers.
SELECT Country, COUNT(Id) AS Customers
  FROM Customer
 WHERE Country <> 'USA'
 GROUP BY Country
HAVING COUNT(Id) >= 9
 ORDER BY COUNT(Id) DESC
Result:  3 records
Country Customers
France 11
Germany 11
Brazil 9

HAVING with AVG BETWEEN

ORDER
Id
OrderDate
OrderNumber
CustomerId
TotalAmount
CUSTOMER
Id
FirstName
LastName
City
Country
Phone
Problem: List customer with average orders between $1000 and $1200.
SELECT FirstName, LastName, 
       CONVERT(DECIMAL(10,2), AVG(TotalAmount)) AS 'Average  Order'
  FROM [Order] O 
  JOIN Customer C ON O.CustomerId = C.Id
 GROUP BY FirstName, LastName
HAVING AVG(TotalAmount) BETWEEN 1000 AND 1200

Note: CONVERT formats the average value to 2 decimals.

Result:  10 records
FirstName LastName Average Order
Miguel Angel Paolino 1081.22
Isabel de Castro 1063.42
Alexander Feuer 1008.44
Thomas Hardy 1062.04
Pirkko Koskitalo 1107.81
Janete Limeira 1174.95
Antonio Moreno 1073.62
Rita Müller 1065.39
José Pedro Freyre 1183.01
Carine Schmitt 1057.39

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