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A table is always created within one schema of one database. Tables also have owners, but unlike in versions of SQL Server prior to 2005, the table owner is not used to access the table. The schema is used for all object access. Normally, a table is created in the default schema of the user who is creating it, but the CREATE TABLE statement can specify the schema in which the object is to be created. A user can create a table only in a schema for which the user has ALTER permissions. Any user in the sysadmin, db_ddladmin, or db_owner roles can create a table in any schema. A database can contain multiple tables with the same name, so long as the tables are in different schemas. The full name of a table has three parts, in the following form: database_name.schema_name.table_name The rst two parts of the three-part name speci cation have default values. The default for the name of the database is whatever database context in which you re currently working. The schema_name actually has two possible defaults when querying. If no schema name is speci ed when you reference an object, SQL Server rst checks for an object in your default schema. If there is no such table in your default schema, SQL Server then checks to see if there is an object of the speci ed name in the dbo schema.
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Note To access a table or other object in a schema other than your default schema or the dbo schema, you must include the schema name along with the table name. In fact, you should get in the habit of always including the schema name when referring to any object in SQL Server 2008. Not only does this remove any possible confusion about which schema you are interested in, but it can lead to some performance bene ts.
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The sys schema is a special case. For compatibility views, such as sysobjects, SQL Server accesses the object in the sys schema prior to any object you might have created with the same name. Obviously, it is not a good idea to create an object of your own called sysobjects, as you will never be able to access it. Compatibility views can also be accessed through the dbo schema, so the objects sys.sysobjects and dbo.sysobjects are the same. For catalog views and Dynamic Management Objects, you must specify the sys schema to access the object.
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You should make column names descriptive, and because you ll use them repeatedly, you should avoid wordiness. The name of the column (or any object in SQL Server, such as a table or a view) can be whatever you choose, so long as it conforms to the SQL Server rule for regular identi ers: it must consist of a combination of 1 through 128 letters, digits, or the symbols #, $, @, or _.
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More Info Alternatively, you can use a delimited identi er that includes any characters you like.
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For more about identi er rules, see Identi ers in SQL Server Books Online. The discussion there applies to all SQL Server object names, not just column names.
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In some cases, you can access a table using a four-part name, in which the rst part is the name of the SQL Server instance. However, you can refer to a table using a four-part name only if the SQL Server instance has been de ned as a linked server. You can read more about linked servers in SQL Server Books Online; I won t discuss them further here.
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Reserved Keywords
Certain reserved keywords, such as TABLE, CREATE, SELECT, and UPDATE, have special meaning to the SQL Server parser, and collectively they make up the SQL language implementation. You should avoid using reserved keywords for your object names. In addition to the SQL Server reserved keywords, the SQL-92 standard has its own list of reserved keywords. In some cases, this list is more restrictive than the SQL Server list; in other cases, it s less restrictive. SQL Server Books Online includes both lists. Watch out for the SQL-92 reserved keywords. Some of the words aren t reserved keywords in SQL Server yet, but they might become reserved keywords in a future SQL Server version. If you use a SQL-92 reserved keyword, you might end up having to alter your application before upgrading it if the word becomes a SQL Server reserved keyword.
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