Write and run SQL statements to complete the following tasks
1. Show sums of line units for each invoice.
2. Show the details of the products that do not have a value for the attribute v_code.
3. Show the details of the invoices whose subtotal is greater than 25 but less than 75.
4. Show the details of the invoice who has the minimum subtotal.
5. Show the codes and names of the vendors who supplied products.
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