Combining Two Queries Producing Unexpected Results

I'm having difficulty coming up with the right syntax for a query. Suppose I have a database containing a Stores table, an ProductInventory table, and a Customers table. The Stores table has an ID field that serves as a foreign key in both the ProductInventory table and in the Customers table. I'm trying to write a query that, for each Store record, will return the total number of records in the ProductInventory table and the total number of records in the Customers table.


The following query returns, for each store, the total number of records in the ProductInventory table:

SELECT Stores.Name,
COUNT(ProductInventory.ID) AS ProductInventoryItemCount
FROM Stores
LEFT JOIN ProductInventory ON Stores.ID = ProductInventory.StoreID
GROUP BY Stores.Name

The following query returns, for each store, the total number of records in the Customers table:

SELECT Stores.Name,
COUNT(Customers.ID) AS CustomerCount
FROM Stores
LEFT JOIN ProductInventory ON Stores.ID = Customers.StoreID
GROUP BY Stores.Name



I combined the two queries:

SELECT Stores.Name,
COUNT(ProductInventory.ID) AS ProductInventoryItemCount,
COUNT(Customers.ID) AS CustomerCount
FROM Stores
LEFT JOIN ProductInventory ON Stores.ID = ProductInventory.StoreID
LEFT JOIN Customers ON Stores.ID = Customers.StoreID
GROUP BY Stores.Name

When I run this last query, however, I get an "Arithmetic overflow error converting expression to data type int" error. Using COUNT_BIG instead of COUNT eliminates the error, but the numbers that are generated are astronomical in size. This indicates to me that there is a *lot* more table joining going on than I expected


What is the correct syntax to produce the desired results? I have a few other tables similar to ProductInventory and Customers; I'm hoping to extend the correct syntax so as to be able to get a comprehensive record count list for each store. Thanks for your help!