OCA Oracle Database 11g: SQL Fundamentals I: A Real World by Steve Ries

By Steve Ries

Ace the 1Z0-051 SQL basics I examination and turn into a winning DBA by way of studying how SQL strategies paintings within the genuine global effectively transparent the 1st stepping stone in the direction of reaching the Oracle qualified affiliate Certification on Oracle Database 11g This publication makes use of a true international example-driven method that's effortless to appreciate and makes enticing entire insurance of the prescribed syllabus study from more than a few self-test inquiries to absolutely equip you with the data to go this examination After examining this ebook, you could input the examination room with self assurance, figuring out that you've got performed all you could to organize for the massive day intimately The Oracle Database 11g: SQL basics I examination is the 1st stepping stone in getting the Oracle qualified affiliate Certification for Oracle Database 11g. The SQL programming language is utilized in each significant relational database this day and realizing the genuine international software of it's the key to changing into a winning DBA. This e-book offers: the fundamental actual international abilities to grasp relational information manipulation with Oracle SQL and prepares you to develop into an Oracle qualified affiliate. novices are brought to recommendations in a logical demeanour whereas practitioners can use it as a connection with leap to appropriate strategies without delay. we start with the necessities of why databases are vital in modern-day details expertise global and the way they paintings. We proceed through explaining the options of querying and enhancing facts in Oracle utilizing quite a number suggestions, together with information projection, choice, production, joins, sub-queries and features. ultimately, we learn how to create and manage database gadgets and to take advantage of them within the comparable means as modern-day professional SQL programmers. This ebook prepares you to grasp the basics of the SQL programming language utilizing an example-driven procedure that's effortless to appreciate. This definitive certification advisor offers a disciplined method of be followed for effectively clearing the 1Z0-051 SQL basics I examination, that's the 1st stepping stone in the direction of achieving the OCA on Oracle Database 11g certification. every one bankruptcy includes considerable perform questions on the finish. A full-blown mock try out is incorporated for perform so that you can try out your wisdom and get a suppose for the particular examination. What you'll examine from this booklet Get insights into the basics of databases and the way they paintings Create and manage databases Create complicated reviews by means of becoming a member of information from a number of tables Use capabilities to govern information for fixing actual global difficulties Create database items from scratch to shop the kinds of information utilized in companies at the present time Use SQL in program improvement combination information transformation utilizing workforce features mix SQL queries technique This publication is filled with actual note examples. each one significant certification subject is roofed in a separate bankruptcy, which is helping to make realizing of thoughts more straightforward. on the finish of every bankruptcy, you will discover a number of perform inquiries to enhance and try out your studying. you'll get a think for the particular SQL basics I examination through fixing perform papers modeled on it. Who this ebook is written for This ebook is for someone who wishes the basic talents to go the Oracle Database SQL basics I examination and use these abilities in way of life as an SQL developer or database administrator.

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Now, we are almost ready to begin writing our own SQL statements. But, first, we'll need to examine the rules. Once that's complete, we will proceed to learn several different basic SQL queries, all derived from the single, most important SQL statement at our disposal—the SELECT statement. With this statement, we can retrieve data from an Oracle database and, by the end of the chapter, will begin to do transformations of the data as well. Beginning with this chapter, we also make note of the Certification objectives covered.

What this book covers Chapter 1, SQL and Relational Database, examines the purpose and use of relational database management systems, including the use of entity relationship diagrams and the structure of tables. We then introduce Structured Query Language and the SQL Developer tool. Chapter 2, SQL SELECT Statements, explores the most foundational SQL clause; the SELECT statement. We use SELECT statements for single and multi-column data retrieval and take a look at using SQL to do basic mathematical operations.

Thus, James R. Johnson, who has two Email Addresses, now has two rows in the database—one for the first e-mail address and one for the second: We have eliminated the repeating groups, but we have now introduced other problems. First, we have violated our primary key, as first, middle, and last name no longer uniquely identify each row. Second, we have begun to duplicate our data. First name, middle initial, last name, and address are all repeated simply for the sake of removing repeating groups.

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