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The structured query language (SQL) is the industry-standard language for creating database structures and manipulating data in a database. SQL can be used interactively, or it can be embedded in programs that access the database. Built-in controls help to insure that the data remain consistent and valid. These controls are called referential integrity constraints. In addition to, or instead of, the standard constraints, a database designer can implement different controls using triggers. Triggers are stored programs that become active when some data element of the database changes. Transactions group related database commands together in order to insure database consistency. If all the actions in the transaction are successful, the transaction will be committed and the changes made permanent, but if any action fails, the transaction will be rolled back, and the database restored to the state it was in at the beginning of the transaction. Database management systems also support stored procedures in order to simplify and streamline access to the data. Stored procedures are programs written in an extended version of SQL. They can be invoked passing parameters, and they can return data to users or programs. Stored procedures have the advantage of being precompiled for extra speed and fewer errors. A database programmer can put substantial application logic into stored procedures, which can then be shared among users and application programs. One can write programs to access databases in a very wide variety of languages. We discussed using JDBC to access databases from the Java language. Other languages use similar techniques to connect to a database, pass commands in SQL, and retrieve sets of data.
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REVIEW QUESTIONS 8.1 Consider designing a database for an antique store. What entities would you include What would their attributes be 8.2 Create a full ER diagram for the antique store mentioned in question 1. The store handles household furnishings, jewelry, toys, and tools. The owner of the store owns most of what they have for sale, but they handle some items on consignment (i.e., they sell the item for the owner, thus earning a commission on the sale). Some customers require delivery, so the owner maintains relationships with several local movers. The owner wants to keep track of customers in order to do a better job of marketing. In particular, they know that some customers are particularly interested in certain types of antiques, and they d like to be able to find, for example, all those customers interested in cameo jewelry. For business auditing and tax purposes, it s very important that the database tracks expenditures and revenues. The owner wants to track what they spent for each item, and what they earned in selling it. These requirements also mean that they have to track store expenses like rent and heat, and their employee expenses (they employ two part-time people to help run the store). 8.3 An inexperienced database designer suggested the following schema for one of the tables in the antique store database: Sales
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Is this schema in 1NF Is this schema in 2NF Is this schema in 3NF If the answer to any of these questions is, No, redesign the table so that the result is in 3NF. 8.4 Two of the tables in the antique store database will be a table of Deliveries, and a table of Delivery_Services. Here are the schemas for the two tables:
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Write the SQL code to create these tables. Specify which columns may not be NULL, and specify primary and foreign key constraints. Note that the Delivery_Service column in the Deliveries table is meant to have the same meaning as the Name column in the Delivery_Services table. 8.5 Here are the schemas for a few more of the tables in one implementation of the antique-store database: Item
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