By understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)

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Java programmers will immediately recognize the analogy, but SQL goes a bit further than Javamthe semantics of SQL UDTs (as well as of SQL's distinct types) can be provided through routines written entirely in SQL (using SQL/PSM's procedural statements), 14 or through routines written in any of the several programming languages that are supported by the SQL standard (and any others supported by specific products). By contrast, Java requires that its methods all be written in a single programming language: Java.

In Volume 1 (Chapter 4, "Basic Data Definition Language (DDL)"), SQL's user-defined types were introduced, drawing a 11 Oscar Nierstrasz, "A Survey of Object-Oriented Concepts," in Object-Oriented Concepts, Databases, and Applications, eds. Won Kim and Frederick H. Lochovsky(New York: ACM Press, 1989), pp. 3-11. : Prentice-Hall, 2000). 4 The SQL Object Model 11 distinction between distinct types and structured types. Volume 1 addressed distinct types in detail, while the discussion of structured types was deferred to this volume.

Won Kim and Frederick H. Lochovsky(New York: ACM Press, 1989), pp. 3-11. : Prentice-Hall, 2000). 4 The SQL Object Model 11 distinction between distinct types and structured types. Volume 1 addressed distinct types in detail, while the discussion of structured types was deferred to this volume. I'll cover UDTs in detail in Chapter 2, "User-Defined Types," so this section serves as an introduction to and a survey of that facility in SQL:1999. SQL:1999's Framework 13 (the part of the SQL standard that defines c o m m o n terms and concepts) introduces structured user-defined types thus: "A structured type is a named, user-defined data type.

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advanced sql 1999 by understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)


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