Question

I have a customer table and an address table. Each customer can have multiple entries in the address table, but only one of those entries can be marked as ‘primary’. I’ve put together the query to pull up the customer and their primary address as follows:

SELECT * FROM customers LEFT JOIN addresses  
         ON customers.cust_id = addresses.cust_id 
WHERE customers.status = 1 AND addresses.primary = 1

I’ve found a flaw in that if the customer has not yet added an address to their account, they will not appear because there is no ‘primary’ address.

What’s the best way to work around this?

Answer 1

SELECT * 
FROM      customers 
LEFT JOIN addresses 
ON        customers.cust_id = addresses.cust_id
AND       1                 = addresses.primary 
WHERE     customers.status = 1