Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. SQL:2003 is the fifth revision of the SQL database query language. The latest revision of the standard is SQL:2008. The latest revision of the standard is SQL:2008.The SQL:1999 standard clearly state in ISO/IEC 9075-2:1999 section 4.6 Boolean types, but many commercial SQL Servers (Microsoft SQL Server 2005, Oracle 9i, IBM DB2) do not support it as a table type, variable type or allow it in the results set. MySQL interprets "BOOLEAN" as a synonym for TINYINT (8-bit signed integer).

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