An interactive SQL tutorial developed and maintained by Edinburgh Napier University. Supports Microsoft SQL Server, Oracle Database, MySQL, IBM DB2, and PostgreSQL. Free. Tutorialspoint.

Other additions include SQL domains and annotations. “Database metadata can now be stored directly alongside the data with the new annotation mechanism inside the Oracle Database,” Oracle said ...

Oracle, in contrast, sold $1.42 billion worth of its database software for Windows in 2006, capturing only 27.1 percent of the market. While that's up from 26.9 percent in 2005, it's down from 29. ...

Using default values on database columns helps to insulate database design issues from application code. Find out how to change a column's default value at a later date using a single command.