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Exercise_2.3.sql

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+SELECT 
+     c.first_name AS First,
+     c.last_name AS Last,
+    a.line1 AS line1,
+   a.city AS city,
+   a.state AS state,
+   a.zip_code AS Address
+FROM
+    customers c
+        INNER JOIN
+    addresses a ON c.customer_id = a.customer_id
+    	      AND c.shipping_address_id = a.address_id
+WHERE
+c.shipping_address_id = a.address_id
+ORDER BY First ASC;

Exercise_2.4.sql

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+SELECT 
+    c.last_name,
+    c.first_name,
+    o.order_date,
+    p.product_name,
+    oi.item_price,
+    oi.discount_amount,
+    oi.quantity
+FROM
+    customers c
+        JOIN
+    orders o ON c.customer_id = o.customer_id
+        JOIN
+    order_items oi ON o.order_id = oi.order_id
+        JOIN
+    products p ON oi.product_id = p.product_id
+ORDER BY c.last_name , o.order_date , p.product_name;

Exercise_2.5.sql

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+SELECT 
+    p1.product_name, p1.list_price
+FROM
+    products p1
+        JOIN
+    products p2 ON p1.product_id != p2.product_id
+        AND p1.list_price = p2.list_price
+WHERE
+    p1.list_price = p2.list_price
+ORDER BY p1.product_name ASC;

Exercise_2.6.sql

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+SELECT 
+    c.category_name, p.product_id
+FROM
+    categories c
+        LEFT OUTER JOIN
+    products p ON c.category_id = p.category_id
+WHERE
+    p.product_id IS NULL
+ORDER BY c.category_name DESC;

Exercise_2.7.sql

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+SELECT 
+    'SHIPPED' AS ship_status, order_id, order_date
+FROM
+    orders
+WHERE
+    ship_date IS NOT NULL 
+UNION SELECT 
+    'NOT SHIPPED' AS ship_status, order_id, order_date
+FROM
+    orders
+WHERE
+    ship_date IS NULL
+ORDER BY order_date ASC;