If you installed Sql Server 2005 Full !
When Your Run Follow:
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use AdventureWorks
go
select * from sales.customer ----it's error!why?
select * from Sales.Customer----it's right!
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This issue is related to your database collation setting.
You can try run this to find out what your database collation is:
SELECT databasepropertyex(AdventureWorks','collation')
The collation of your database makes your query case sensitive.
If you want a quick change, you can change your database to another collation which is not case sensitive, for examle:
ALTER DATABASE AdventureWorks COLLATE SQL_Latin1_General_CP1_CI_AS
You can search Books online for more information on collation.
AND
There are some limitations on altering collation of a database, maybe there are some SCHEMABINGING views in the database. you can refers to SQL2005 Books Online, and locate:
'ALTER DATABASE (Transact-SQL)' topic ->'Remarks' section->'Changing the Database Collation'.
