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It also describes many of the more important SQL statements that are used for the following types of operations: My SQL's SQL statements can be grouped into several broad categories; Table 3.1 lists some representative statements for each.In some cases, a utility program is available that provides a command-line interface to a statement.Fluency with SQL is necessary for effective communication with the My SQL server, because that is the language that it understands.For example, when you use a program such as the mysql client, it functions primarily as a means for you to send SQL statements to the server to be executed.These are capabilities found in some other databases but not in My SQL.Such features include triggers, stored procedures, and views.The syntax for all SQL statements implemented by My SQL is listed in Appendix D, "SQL Syntax Reference." In addition, you should consult the My SQL Reference Manual for additional information, especially for changes made in recent versions of My SQL.

Chapter 1, "Getting Started with My SQL and SQL," presented a tutorial introduction to many of My SQL's capabilities.Triggers, stored procedures, and views are scheduled for implementation in the future.Almost every SQL statement refers in some way to a database or its constituent elements.In this chapter both of these topics will be covered.A pre-existing table in a database may be modified using the SQL ALTER TABLE statement.

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