doc: How to retrieve data from 2 or more tables

How_to_retrive_data_from_two_or_more_tables.sql

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+/*1*/
+SELECT
+	category_name,
+    product_name,
+    list_price
+FROM 
+	products p
+JOIN 
+	categories c
+ON 
+	c.category_id = p.category_id
+ORDER BY 
+	category_name, 
+    product_name;
+
+/*2*/
+SELECT 
+	first_name,
+    last_name,
+    line1,
+    city,
+    state,
+    zip_code
+FROM 
+	addresses a
+JOIN
+	customers c
+ON 
+	a.customer_id = c.customer_id
+WHERE 
+	email_address LIKE "allan.sherwood%";
+    
+/*3*/
+SELECT
+    first_name,
+    last_name,
+    line1,
+    city,
+    state,
+    zip_code
+FROM 
+	addresses a
+JOIN
+	customers c
+ON 
+	a.customer_id = c.customer_id
+WHERE
+	address_id = shipping_address_id;
+    
+/*4*/
+SELECT
+	last_name,
+    first_name,
+    order_date,
+    product_name,
+    item_price,
+    discount_amount,
+    quantity
+FROM
+	customers c
+JOIN
+	orders o
+ON 
+	c.customer_id = o.customer_id
+JOIN
+	order_items i
+ON 
+    o.order_id = i.order_id
+JOIN
+	products p
+ON
+	i.product_id = p.product_id
+ORDER BY 
+	last_name, order_date, product_name;
+    
+/*5*/
+SELECT 
+	p1.product_name,
+    p2.list_price
+FROM 
+	products p1
+JOIN 
+	products p2
+ON 
+	p1.product_id <> p2.product_id
+    AND p1.list_price = p2.list_price
+ORDER BY product_name;
+
+/*6*/
+SELECT 
+	category_name,
+    product_id
+FROM
+	categories c
+LEFT OUTER JOIN 
+	products p
+ON
+	c.category_id = p.category_id
+WHERE 
+	product_id IS NULL;
+    
+/*7*/
+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;