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Editorial Team
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Asked: 2026-06-03T14:50:46+00:00

I’m using the MySQL classicmodels database. The following query works fine (note the where

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I’m using the MySQL classicmodels database. The following query works fine (note the where clause)

select 
    customers.customerNumber as 'Customer ID',
    customers.customerName as 'Customer Name',
    count(orders.orderNumber) as 'Total Orders Placed'
from customers
left join orders on customers.customerNumber = orders.customerNumber
where customers.customerNumber > 200
group by
    customers.customerNumber
order by 
    3 asc

But the following results in an error. The intention is to display only those customers in the resulting set of rows, who have placed more than 3 orders. What am I doing wrong?

select 
    customers.customerNumber as 'Customer ID',
    customers.customerName as 'Customer Name',
    count(orders.orderNumber) as 'Total Orders Placed'
from customers
left join orders on customers.customerNumber = orders.customerNumber
where count(orders.orderNumber) > 3
group by
    customers.customerNumber
order by 
    3 asc

MySQL error is: Error Code: 1111. Invalid use of group function

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1 Answer

  1. Editorial Team

    Aggregate functions (COUNT(), AVG(), SUM(), etc) cannot appear in the WHERE clause, owing to when they are calculated. Instead, they belong in a HAVING clause:

    select 
    customers.customerNumber as 'Customer ID',
    customers.customerName as 'Customer Name',
    count(orders.orderNumber) as 'Total Orders Placed'
from customers
left join orders on customers.customerNumber = orders.customerNumber
group by
    customers.customerNumber
HAVING count(orders.orderNumber) > 3
order by 
    3 asc
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