Download A Guide to SQL (8th Edition) by Philip J. Pratt, Mary Z. Last PDF

By Philip J. Pratt, Mary Z. Last

A consultant TO SQL, 8E, is still the fundamental SQL reference. It builds at the luck of past variations by way of providing uncomplicated SQL instructions within the context of a operating case within which a company makes use of SQL to control orders, components, consumers, and revenues reps. The booklet covers the basics of SQL programming utilizing user-friendly guide and large hands-on workouts. carrying on with with its specialise in studying the fundamentals whatever the database surroundings selected, this variation beneficial properties examples from the most recent databases: Oracle 11g, entry 2007, and MySQL. The 8th variation expands at the use of working case reviews by way of including a 3rd operating case to the wide hands-on pedagogy on the finish of each bankruptcy.

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Extra info for A Guide to SQL (8th Edition)

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The fact that the unique identifier for customers is the customer number gives the following functional dependencies: CUSTOMER_NUM CUSTOMER_NAME, STREET (CUSTOMER), CITY (CUSTOMER), STATE (CUSTOMER), ZIP (CUSTOMER), BALANCE, CREDIT_LIMIT, REP_NUM, LAST_NAME, FIRST_NAME Chapter 2 Q&A Question: Do you really need to include the last name and first name of a sales rep in the list of attributes determined by the customer number? Answer: There is no need to include them in this list, because they both can be determined from the sales rep number and are already included in the list of attributes determined by REP_NUM.

A table (relation) is in first normal form (1NF) when it does not contain a repeating group. Database Design Fundamentals 42 For example, in the design process you might create the following ORDERS table, in which there is a repeating group consisting of PART_NUM and NUM_ORDERED. The notation for this table is as follows: ORDERS (ORDER_NUM, ORDER_DATE, (PART_NUM, NUM_ORDERED) ) This notation describes a table named ORDERS that consists of a primary key, ORDER_NUM, and a column named ORDER_DATE.

In the ORDERS table, PART_NUM was the key to the repeating group and ORDER_NUM was the primary key for the table. When converting the unnormalized data to first normal form, the primary key becomes the concatenation of the ORDER_NUM and PART_NUM columns. Second Normal Form The following ORDERS table is in first normal form, because it does not contain a repeating group: ORDERS (ORDER_NUM, ORDER_DATE, PART_NUM, DESCRIPTION, NUM_ORDERED, QUOTED_PRICE) The table contains the following functional dependencies: ORDER_NUM ORDER_DATE DESCRIPTION PART_NUM NUM_ORDERED, QUOTED_PRICE ORDER_NUM, PART_NUM Database Design Fundamentals 44 This notation indicates that ORDER_NUM alone determines ORDER_DATE, and PART_NUM alone determines DESCRIPTION, but it requires both an ORDER_NUM and a PART_NUM to determine either NUM_ORDERED or QUOTED_PRICE.

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