In this article we will discuss on the difference between SET QUOTED_IDENTIFIER ON and SET QUOTED_IDENTIFIER OFF. Please go through the article SET QUOTED_IDENTIFIER ON/OFF Setting in Sql Server to have detailed information on this setting. As a better practice we should always use SET QUOTED_IDENTIFIERS ON setting.
|SET QUOTED_IDENTIFIER ON||SET QUOTED_IDENTIFIER OFF|
|Characters Enclosed within double quotes||is treated as Identifier||is treated as Literal|
|Try using Characters Enclosed within double quotes as identifier||Works
Example: Below statement to create a table with table name “Table” succeeds.
SET QUOTED_IDENTIFIER ON GO CREATE TABLE dbo."Table" (id int, "Function" VARCHAR(20)) GO
Example: Below statement to create a table with table name “Table” Fails.
SET QUOTED_IDENTIFIER OFF GO CREATE TABLE dbo."Table" (id int, "Function" VARCHAR(20)) GO
|Try using Characters Enclosed within double quotes as Literal.||Fails
Example: Below statement fails.
SET QUOTED_IDENTIFIER ON GO SELECT "BIRADAR"
Example: Below Statement Works.
SET QUOTED_IDENTIFIER OFF GO SELECT "BIRADAR"
|Characters Enclosed within single quotes||is treated as Literal
SET QUOTED_IDENTIFIER ON GO SELECT 'BIRADAR'
|is treated as Literal
SET QUOTED_IDENTIFIER OFF GO SELECT 'BIRADAR'
|How to find all the objects which are created with SET QUTOED IDENTIFIER ON/OFF||Below Statement can be used to find all the objects created with SET QUTOED_IDENTIFIER setting as ON:
SELECT OBJECT_NAME(object_id) FROM sys.sql_modules WHERE uses_quoted_identifier = 1
|Below Statement can be used to find all the objects created with SET QUTOED_IDENTIFIER setting as OFF:
SELECT OBJECT_NAME(object_id) FROM sys.sql_modules WHERE uses_quoted_identifier = 0
|Which One to USE?||Best practice is to use the SET QUOTED_IDENTIFIER ON setting.||Try to avoid using SET QUOTED_IDENTIFIER OFF setting. As more and more new features require this setting value to be ON. For example while working with Filtered Indexes SET QUOTED_IDENTIFIER setting should be ON otherwise we will get into an exception as demonstrated in the article INSERT/UPDATE failed because the following SET options have incorrect settings: ‘QUOTED_IDENTIFIER’ ….|
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Please correct me, if my understanding is wrong. Comments are always welcome.