Download Beginning Oracle SQL by Lex de Haan, Daniel Fink, Tim Gorman, Inger Jørgensen, Karen PDF

By Lex de Haan, Daniel Fink, Tim Gorman, Inger Jørgensen, Karen Morton (auth.), Jonathan Gennick, Clay Andres, Steve Anglin, Mark Beckner, Ewan Buckingham, Gary Cornell, Jonathan Hassell, Michelle Lowman, Matthew Moodie, Duncan Parkes, Jeffrey Pepper, Frank

Beginning Oracle SQL is your creation to the interactive question instruments and particular dialect of SQL used with Oracle Database. The booklet is a revision of the vintage Mastering Oracle SQL and SQL*Plus via Lex de Haan, and has been up to date to hide advancements in Oracle's model of the SQL question language. Written in an easygoing and example-based type, Beginning Oracle SQL is the e-book that may get you all started down the trail to effectively writing SQL statements and getting effects from Oracle database.

  • Takes an example-based process, with transparent and authoritative reasons
  • Introduces either SQL and the question instruments used to execute SQL statements
  • Shows the right way to create tables, populate them with info, after which question that facts to generate company effects

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Extra info for Beginning Oracle SQL

Example text

Sometimes, the outcome is UNKNOWN, such as when you have rows with missing information. We will revisit this topic in more detail in Chapter 4, when we discuss null values. Logical Operators SQL also offers three operators whose operands are conditions: the logical (or Boolean) operators. Table 2-7 lists these operators. Table 2-7. SQL Logical Operators Operator Description AND Logical AND OR Logical OR (the inclusive OR) NOT Logical negation Expressions An expression is a well-formed string containing variables, constants, operators, or functions.

8 The Oracle Software Environment Oracle Corporation has its headquarters in Redwood Shores, California. It was founded in 1977, and it was (in 1979) the first vendor to offer a commercial RDBMS. 17 CHAPTER 1 „ RELATIONAL DATABASE SYSTEMS AND ORACLE The Oracle software environment is available for many different platforms, ranging from personal computers (PCs) to large mainframes and massive parallel processing (MPP) systems. This is one of the unique selling points of Oracle: it guarantees a high degree of independence from hardware vendors, as well as various system growth scenarios, without losing the benefits of earlier investments, and it offers extensive transport and communication possibilities in heterogeneous environments.

Table 2-1. The Six Main Components of the SELECT Command Component Description FROM Which table(s) is (are) needed for retrieval? WHERE What is the condition to filter the rows? GROUP BY How should the rows be grouped/aggregated? HAVING What is the condition to filter the aggregated groups? SELECT Which columns do you want to see in the result? ORDER BY In which order do you want to see the resulting rows? „ Tip The order of the SELECT command components as displayed in Table 2-1 is also a good order to think about them when writing SQL statements.

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