published solutions

exercise-1.sql

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+SELECT vendor_name, vendor_contact_last_name, vendor_contact_first_name
+FROM vendors
+ORDER BY vendor_contact_last_name, vendor_contact_first_name

exercise-2.sql

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+SELECT CONCAT(vendor_contact_last_name, ', ', vendor_contact_first_name) AS full_name
+FROM vendors
+WHERE vendor_contact_last_name < 'D' OR vendor_contact_last_name LIKE 'E%'
+ORDER BY vendor_contact_last_name, vendor_contact_first_name

exercise-3.sql

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+SELECT invoice_due_date AS "Due Date", 
+       invoice_total AS "Invoice Total", 
+       invoice_total / 10 AS "10%",
+       invoice_total * 1.1 AS "Plus 10%"
+FROM invoices
+WHERE invoice_total >= 500 AND invoice_total <= 1000
+ORDER BY invoice_due_date DESC

exercise-4.sql

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+SELECT invoice_number,
+       invoice_total,
+       payment_total + credit_total AS payment_credit_total,
+       invoice_total - payment_total - credit_total AS balance_due
+FROM invoices
+WHERE invoice_total - payment_total - credit_total > 50
+ORDER BY balance_due DESC
+LIMIT 5;

exercise-5.sql

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+SELECT invoice_number, 
+       invoice_date, 
+       invoice_total - payment_total - credit_total AS balance_due,
+       payment_date
+FROM invoices
+WHERE payment_date IS NULL

exercise-6.sql

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+SELECT DATE_FORMAT(CURRENT_DATE, '%m-%d-%Y') AS "current_date"

exercise-7.sql

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+SELECT 50000 AS starting_principle,
+       50000 * .065 AS interest,
+       (50000) + (50000 * .065) AS principle_plus_interest