What does it mean to have quoted_identifier on? What are the implications of having it off?

.NET Database ,COM interop,and .NET deployment questions and answers

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What does it mean to have quoted_identifier on? What are the implications of having it off?

SET QUOTED_IDENTIFIER ON- Causes SQL Server to follow the SQL-92 rules regarding quotation mark delimiting identifiers and literal strings. Identifiers delimited by double quotation marks can be either Transact-SQL reserved keywords or can contain characters not usually allowed by the Transact-SQL syntax rules for identifiers.

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