SQL:2003,the most current standard for SQL,specifies a single level of conformance called Core SQL.Conformance to that standard is an issue; the major vendors lack support of some features and provide proprietary support for other features.

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SQL:2003 specifies a single level of conformance called Core SQL, but there is variability in vendor support for different features.

SQL:2003,the Most Current Standard for SQL,specifies a Single Level of Conformance