Sort joins by relationship risk

Place each join in its relationship bucket. One-to-one Many-to-one lookup One-to-many expansion Many-to-many danger Employee table to payroll table where employee_id is unique on both sides Invoices to current customer attributes by customer_id Orders to line items by order_id Customers to free-form tags where both tables repeat customer_id Products to latest product category after filtering to current category Accounts to contacts where each account can have several contacts

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