By Charles A Bell

ISBN-10: 1590597419

ISBN-13: 9781590597415

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MySQL is also licensed as a commercial product. A commercial license permits MySQL AB to own the source code (as described earlier) as well as own the copyright on the name, logo, and documentation (such as books). This is unique because most open source companies do not ascribe to owning anything; rather, their intellectual property is their experience and expertise. MySQL AB has retained the intellectual property of the software while leveraging the support of the global community of developers to expand and evolve the software.

7. M. Stonebraker and J. L. , edited by Michael Stonebraker (Morgan Kaufmann Publishers, 1998). fm Page 33 Monday, November 20, 2006 4:32 PM CHAPTER 2 ■ THE ANATOMY OF A DATABASE SYSTEM 3. If a GROUP BY clause exists, form groups in the results on the attributes specified. 4. If a HAVING clause exists, apply a filter for the groups. 5. If an ORDER BY clause exists, sort the results in the manner specified. 6. If a DISTINCT keyword exists, remove the duplicate rows from the results. The previous code example is representative of most SQL commands; all such commands have required portions, and most also have optional sections as well as keyword-based modifiers.

Tasks include creating and altering tables, defining indexes, and managing constraints. The data manipulation language (DML) is used by database professionals to query and update the data in databases. Tasks include adding and updating data as well as querying the data. These two language groups form the majority of commands that database systems support. SQL commands are formed using a specialized syntax. The following presents the syntax of a SELECT command in SQL. The notation depicts user-defined variables in italics and optional parameters in square brackets ([]).

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Expert MySQL by Charles A Bell

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