OCA Oracle database 11g : SQL fundamentals I : a real world by Steve Ries

By Steve Ries

This ebook is filled with genuine note examples. every one significant certification subject is roofed in a separate bankruptcy, which is helping to make knowing of ideas more straightforward. on the finish of every bankruptcy, you will discover numerous perform inquiries to enhance and try your studying. you'll get a consider for the particular SQL basics I examination via fixing perform papers modeled on it. This e-book is for a person who wishes the fundamental abilities to cross 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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Com/technology and view the documentation for it. Summary In this chapter, we've gone from the early days of databases to the relational databases that are so prolific today. We've explored the concept of normalization and how it's applied to the relational paradigm. We've looked at tables and how they are structured and introduced the Structured Query Language for relational databases. We've also examined some of the popular SQL tools and created the tables needed for the Companylink database.

MySQL, on the other hand, uses a keyword, CONCAT. Additionally, RDBMS software manufacturers often add functionalities to their own SQL implementations. In Oracle version 10g, a new type of syntax was included to join data from two or more tables that differs significantly from the ANSI standard. Oracle does, however, still support the ANSI standard as well. SQL in the real world Although the SQL implementations of the major RDBMS products differ, they all conform to the basic ANSI standard. That means if you learn how SQL is used in one database product, such as Oracle, much of your acquired knowledge should transfer easily to other database products.

This statement, using *, would retrieve the same columns and in the same order as if we selected each of the columns individually, as shown in the following screenshot: [ 47 ] SQL SELECT Statements While either method achieves the same goal, remember that using * will only retrieve columns in the order that they exist in, in the table. Should you need to display all columns in a different order, it is necessary to select each column in the table by name. SQL in the real world In some IT shops, the coding standards of a particular group may preclude the use of * in SQL statements, and that's not necessarily a bad thing.

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