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A join is the combining of results from more than one table in a query. This is a crucial technique for RDBMS systems for all but simple queries. Let s consider how this works by reviewing the basics of relationships in an RDBMS. Relational database tables each have a primary key, which uniquely identifies each row in the table. Suppose you had several orders from one customer over a period of time. It would be inefficient and error-prone to enter customer address data into each order individually. If order data was held in an orders table, then the corresponding customer data would be held in a customers table. A mechanism is needed to express the fact that a particular customer in the customers table is the customer for a particular order in the orders table. If the customers table contains a customer_id column that is the table s primary key, then we can create a customer_id column in the orders table as a foreign key. This expresses the fact that a particular order is linked to a particular customer. Let s assume that we want to retrieve all orders for a particular customer. We will assume that an order can be made up of only a single type of product, and that the orders table contains the following columns: order_id, product_id, product_quantity, customer_id, and order_date. To simplify, we will assume that the customers table consists of customer_id, customer_name, and customer_address columns. We can use a SELECT statement similar to the following:

SELECT order_id, product_id, product_quantity, order_date, customer_name, customer_address FROM orders, customers WHERE orders.customer_id='ABC123' AND orders.customer_id = customers.customer_id ;

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This will retrieve all orders for the customer who has the ID of ABC123 . The SELECT statement is similar to several you have seen earlier in this appendix, but notice that some of the columns are in the orders table, and some columns (customer_name and customer_address) are in the customers table. This is indicated by the FROM clause which specifies both the orders and customers tables. We need to filter the retrieved rows, so we do that using a two part WHERE clause. The first part of the WHERE clause specifies that we want data on the customer whose customer_id is ABC123 . The second part specifies that all retrieved rows from the customers table must have a customer_id column equal to the customer_id column in the orders table. This uses notation which will be familiar to you a . separates the name of the table object from the name of the column object:

#include <iostream> #include <cstring> using namespace std; class str_type { char string[80]; public: str_type(char *str = "") { strcpy(string, str); } str_type operator+(str_type str); // concatenate str_type operator=(str_type str); // assign // output the string void show_str() { cout << string; } };

you want to inspect details by zooming in on certain places of the image, you would need a larger resolution (as large as the level of details you want to inspect). For comparing how the image resolution impacts the photograph visual quality, I will show you how different resolutions look when the photograph is displayed at a fixed size on the screen. Figures 2-2 through 2-4 were scaled to the same viewing size of 704 528 without interpolation. This size is similar but slightly larger than the common normal sizes shown in popular online photo albums. Note how the quality improves when the resolution is increased.

So far so good, but suppose we also want to retrieve price data, which is held in a separate prices table. We need a join that retrieves data from three tables. The following code will achieve that:

The justification for doing VoIP on a VPN is primarily security, along with the reduced cost of VoIP. Depending on usage, voice generates relatively large amounts of traffic. Be sure to include this additional traffic in your sizing estimates. Our discussion of VoIP applies to whether we have a VPN or not (see 30 ). With a VPN, the delays due to encryption are larger, and therefore we would expect that the performance of voice over the VPN would be worse than voice over IP. If we have chosen a network provider who will offer a SLA with QoS, there is a better chance for success, but the delays due to encryption and basic packet switching will still be there. With the exception of international calling, one must have a very large calling volume to make it worthwhile to put voice over the Internet and suffer the attendant quality reduction.

SELECT order_id, product_id, product_price, product_quantity, order_date, customer_name, customer_address FROM orders, customers, prices WHERE orders.customer_id='ABC123' AND orders.customer_id = customers.customer_id AND orders.product_id = prices.product_id ;

Notice the additional AND clause:

Part I:

This clause expresses our desire to retrieve only products relevant to our query. SQL allows us to construct joins from arbitrary numbers of tables.

CONSTRAINT PKLists PRIMARY KEY (HomeNo), CONSTRAINT FKAgentld FOREIGN KEY (Agentld) REFERENCES Agent, CONSTRAINT FKHomeNo FOREIGN KEY (HomeNo) REFERENCES Home )

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