Delimiting Identifiers in VS .NET

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Delimiting identifiers is a fancy way of saying identifying names If we have a table named Customer with a column named LastName, we can identify it with two types of delimiters: brackets and single quotes It would look like [LastName] or LastName Using brackets is standard, so you ll probably see it this way most often, but single quotes can also be used if the QUOTED_IDENTIFIER option is on This is one of the database options that can be viewed in the miscellaneous section of the database Options property page However, it s generally not necessary to delimit identifiers Usually, we can omit the brackets and the single quotes, and based on where the identifier is in the statement, it will be identified correctly Two situations require you to delimit identifiers:
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If any spaces exist in the identifier, you must delimit the identifier For example, [LastName] has no spaces so you do not need to include the square brackets, but [Last Name] does so you must delimit it The delimiter in LastName can be omitted, but the delimiter in [Last Name] must be added When using reserved keywords as an identifier, such as using the reserved word View to name a table used in a tourist database, [View] must be delimited when used Using reserved words is not recommended and is only supported for backward compatibility Consider this usage deprecated
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4: Transact-SQL
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Case Sensitive and Case Insensitive
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Is your database sensitive I mean case sensitive, as in does it care whether you enter or search data in mixed case, such as UPPERCASE and lowercase If it is case sensitive and you don t use the exact case in your scripts as the objects are created in your database, the scripts won t work NOTE If you installed AdventureWorks from the exercises in 1 and didn t modify the collation, the collation is set to case insensitive (CI) If you downloaded an AdventureWorks sample database from one of Microsoft s Web sites and installed it, you could have chosen a downloadable version that is case sensitive or case insensitive If you re using a case sensitive collation, you can sometimes get unexpected errors that can be frustrating if you can t figure them out The following section will help you determine the collation, and the errors you can expect if you re using a casesensitive collation From a workability perspective, it usually doesn t matter how you enter most of the commands in your scripts as all uppercase or all lowercase, or following best practices If the collation is set to CI (case insensitive), your scripts will work no matter what case you use On the other hand, if the collation is set to CS (case sensitive) the data and the database objects must match or the queries will fail to retrieve what you re requesting If the collation is changed on the database, it changes the sensitivity of not only the data within the database, but also the naming of all objects within the database This is the type of problem that has caused me to bang my head against the wall for hours until I figure out why a script that worked on one system doesn t work on another system Hopefully, I can save you from needless head banging Consider the following script:
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use adventureworks go select * from salessalesorderheader
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If the collation is set to CS, this script will fail with an error saying that sales salesorderheader can t be found because the object within the AdventureWorks database is named SalesSalesorderHeader The object salessalesorderheader is not the same as SalesSalesorderHeader with a CS collation It will work fine with the collation of CI Now look at the following script:
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