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There are a number of ways you can classify statements in addition to how they re classified in the preceding list. For example, you can classify them according to how they re executed or whether or not they can be embedded in a standard programming language. The SQL:2006 standard provides ten broad categories based on function. However, I use the preceding method because it is commonly used in SQL-related documentation and because it is a simple way to provide a good overview of the functionality inherent in SQL.
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In addition to defining how the language can be used, the SQL:2006 standard provides details on how SQL statements can be executed. These methods of execution, known as binding styles, not only affect the nature of the execution, but also determine which statements, at a minimum, must be supported by a particular binding style. The standard defines four methods of execution:
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Direct invocation By using this method, you can communicate directly from a front-end application, such as iSQL*Plus in Oracle or Management Studio in Microsoft SQL Server, to the database. (The front-end application and the database can be on the same computer, but often are not.) You simply enter your query into the application window and execute your SQL statement. The results of your query are returned to you as immediately as processor power and database constraints permit. This is a quick way to check data, verify connections, and view database objects. However, the SQL standard s guidelines about direct invocation are fairly minimal, so the methods used and SQL statements supported can vary widely from product to product.
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Embedded SQL In this method, SQL statements are encoded (embedded) directly in the host programming language. For example, you can embed SQL statements within C application code. Before the code is compiled, a preprocessor analyzes the SQL statements and splits them out from the C code. The SQL code is converted to a form the RDBMS can understand, and the remaining C code is compiled as it would be normally. Module binding This method allows you to create blocks of SQL statements (modules) that are separate from the host programming language. Once the module is created, it is combined into an application with a linker. A module contains, among other things, procedures, and it is the procedures that contain the actual SQL statements. Call-level interface (CLI) A CLI allows you to invoke SQL statements through an interface by passing SQL statements as argument values to subroutines. The statements are not precompiled as they are in embedded SQL and module binding. Instead, they are executed directly by the RDBMS.
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Direct invocation, although not the most common method used, is the one I ll be using primarily for the examples and exercises in this book because it supports the submission of ad hoc queries to the database and generates immediate results. However, embedded SQL is currently the method most commonly used in business applications. I discuss this method, as well as module binding and CLI, in greater detail in 17.
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You state that, for an RDBMS to be in conformance with the SQL:2006 standard, it must comply with Core SQL. Are there any additional requirements to which a product must adhere Yes. In addition to Core SQL, an RDBMS must support either embedded SQL or module binding. Most products support only embedded SQL, with some supporting both. The SQL standard does not require RDBMS products to support direct invocation or CLI, although most do. What are the ten categories used by the SQL:2006 standard to classify SQL statements The SQL standard classifies statements into the following categories: schema, data, data change, transaction, connection, control, session, diagnostics, dynamic, and embedded exception declaration. Keep in mind that these classifications are merely a tool that you can use to better understand the scope of the language and its underlying concepts. Ultimately, it is the SQL statements themselves and what they can do that is important.
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