published solutions

exercise-1.sql

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+INSERT INTO terms
+    (terms_id, terms_description, terms_due_days)
+VALUES
+    (6, 'Net due 120 days', 120)

exercise-2.sql

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+UPDATE terms
+SET terms_description = 'Net due 125 days',
+    terms_due_days = 125
+WHERE terms_id = 6

exercise-3.sql

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+DELETE FROM terms
+WHERE terms_id = 6

exercise-4.sql

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+INSERT INTO invoices
+VALUES (DEFAULT, 32, 'AX-014-027', '2018-08-01', 434.58, 0, 0,
+        2, '2018-08-31', NULL)

exercise-5.sql

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+INSERT INTO invoice_line_items VALUES
+    (115, 1, 160, 180.23, 'Hard drive'),
+    (115, 2, 527, 254.35, 'Exchange Server update')

exercise-6.sql

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+UPDATE invoices
+SET credit_total = invoice_total * .1,
+    payment_total = invoice_total - credit_total
+WHERE invoice_id = 115

exercise-7.sql

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+UPDATE vendors
+SET default_account_number = 403
+WHERE vendor_id = 44

exercise-8.sql

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+UPDATE invoices
+SET terms_id = 2
+WHERE vendor_id IN
+    (SELECT vendor_id
+     FROM vendors
+     WHERE default_terms_id = 2)

exercise-9.sql

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+DELETE FROM invoice_line_items
+WHERE invoice_id = 115;
+
+DELETE FROM invoices
+WHERE invoice_id = 115;