SQL Server 2005 Reserved Keywords
Reserved Keywords are part of the grammar of the Transact-SQL language used by SQL Server to parse and understand Transact-SQL statements and batches. Although it is syntactically possible to use SQL Server reserved keywords as identifiers and object names in Transact-SQL scripts, this can be done only using delimited identifiers. It is recommended to not use the reserved keywords as identifiers or object names. more
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