Reading the Diagrams Used in This Book

The numerous diagrams throughout the book illustrate the proper syntax for the statements, terms, and phrases you’ll use when you work with SQL. Each diagram provides a clear picture of the overall construction of the SQL element currently being discussed. You can also use any of these diagrams as templates to create your own SQL statements or to help you acquire a clearer understanding of a specific example.

All the diagrams are built from a set of core elements and can be divided into two categories: statements and defined terms. A statement is always a major SQL operation, such as the SELECT statement we discuss in this book, while a defined term is always a component used to build part of a statement, ...

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