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I don't understand this correlated subquery


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My question: Why does the inner query need a table alias? 

Q: Use a correlated subquery to return one row per vendor 
representing the vendor's largest invoice. 

Each row should include vendor_id, vendor_name, invoice_total,
and invoice_date. Order by invoice_totol in DESC.

SELECT v.vendor_id, vendor_name, invoice_total, invoice_date
FROM vendors v JOIN invoices i ON v.vendor_id = i.vendor_id
WHERE invoice_total = (
    SELECT MAX(invoice_total) FROM invoices
    WHERE vendor_id = v.vendor_id
ORDER BY invoice_total DESC;   -- 41 vs he got 36.

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