Related Objects

I have a case in which I need to return only 1 field from the related
object (table).
The docs give an example where I can return the related object in a
query, but I need only one field from the related object.

For Example:

I retrieve all the customers from the 'Customers' table. Each
customer has many projects associated. (I am writing a project
management system)

I am using a template where I have an html table which lists all the
customers (column 1), and then the number of projects associated with
the customer (column 2)

Customer | Number of Projects
---------------------------------------------------
customer 1 | 4
customer 2 | 5

I can see clearly from the docs how to retrieve the entire projects
table (from the foreign key), but I would be wasting resources by
retrieving the entire table (mostly feeling like I am throwing data
all over the place unnecessarily)

I hope I have described the problem clearly. Thank you in advance for
any help you can give.

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