Sams Teach Yourself SQL in 24 Hours, Second Edition

Summary

This hour discussed extensions to standard SQL among vendors' implementations and their compliance with the ANSI standard. Once you learn SQL, you can easily apply your knowledge—and your code—to other implementations of SQL. SQL is portable between vendors, being that most SQL code can be utilized among most implementations with a few minor modifications.

The last part of this hour was spent showing two specific extensions used by three implementations. Transact-SQL is used by Microsoft SQL Server and Sybase, and PL/SQL is used by Oracle. You should have seen some similarities between Transact-SQL and PL/SQL. One thing to note is that these two implementations have first sought their compliance with the standard, and then added enhancements ...