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.
Read Online or Download A Guide to SQL (8th Edition) PDF
Best technology books
* the last word troubleshooting and service reference for pro technicians and hobbyists specializes in the preferred patron digital devices
* All significant patron electronics troubleshooting techniques--for the 1st time anywhere!
* 1000's of illustrations clarifying powerful troubleshooting and service methods
* entire, updated troubleshooting and service insurance of reliable- country TVs, audio/video cassette gamers, CD avid gamers, camcorders, and extra
With greater than a hundred and sixty entries detailing every little thing from the junk buried in table drawers to that mysterious field blinking away within the coat closet, this sensible consultant navigates via sleek place of work know-how. each one access incorporates a sensible description of a tool (what it really is and the way it really works) in addition to details on who invented it and the way its layout has advanced through the years.
Along with his understanding eye and depraved pen, Michael Lewis finds how the web increase has inspired alterations within the manner we are living, paintings, and imagine. in the middle of one of many maximum prestige revolutions within the historical past of the area, the net has develop into a weapon within the arms of revolutionaries. previous priesthoods are crumbling.
- New Directions in Terahertz Technology
- Reshaping Society through Analytics, Collaboration, and Decision Support: Role of Business Intelligence and Social Media (Annals of Information Systems, Volume 18)
- The Virtual Utility: Accounting, Technology & Competitive Aspects of the Emerging Industry
- Air engines : the history, science, and reality of the perfect engine
Extra info for A Guide to SQL (8th Edition)
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.