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... reserved keywords and can include characters not generally allowed in Transact-SQL identifiers. Double quotation marks cannot be used to delimit literal string expressions; single ... http://msdn.microsoft.com/en-us/library/ms174393.aspx
When QUOTED_IDENTIFIER is OFF, SQL Server follows these rules for the use of single and double quotation marks: Quotation marks cannot be used to delimit identifiers. http://msdn.microsoft.com/en-us/library/aa224033(SQL.80).aspx
... be reserved keywords and can include characters not usually allowed in Transact-SQL identifiers. Double quotation marks cannot be used to delimit literal string expressions; single ... http://doc.ddart.net/mssql/sql70/set-set_30.htm
If the database supports delimited identifiers, double quotes ( " ) must enclose every SQL identifier in your code, and single ( ' ) quotes, rather than double ( " ) quotes, must ... http://publib.boulder.ibm.com/infocenter/idshelp/v10/topic/com.ibm.sqls.doc/sqls1119.htm
A schema qualified name may consist of a single SQL identifier (in which case the schema-name is implicit) or a schema-name followed by a period and an SQL identifier. http://publib.boulder.ibm.com/infocenter/db2v7luw/topic/com.ibm.db2v7.doc/cpsqlrv1/ibmsqlr34.htm#HDRQUALUN2
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