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The format of this syntax is straightforward. In this case, CREATE LOGIN instructs SQL Server that you want to create a new login called FAT-BELLY\Apress_Client_Information, where FAT-BELLY is the name of the network domain in which the Apress_Client_Information group can be found. You should change the prefix to match your own setup. Here the definition appears surrounded with optional square brackets in case of spaces in the name. Next, the keywords FROM WINDOWS inform SQL Server that you are creating a login with Windows authentication. After that, you define the name of the database that the login will connect to when a connection is made using WITH DEFAULT_DATABASE. Finally, the second option specifies the default language the connection will use, although it is possible at any time to alter the language using the Set Language option. This allows this group to connect to SQL Server. 4. Once you have placed the code in your query pane, you can execute it by pressing either Ctrl+E or F5 or by clicking the Execute button on the toolbar. Once it finishes executing, you should see the new login in the Security node within the Object Explorer on the left, as shown in Figure 4-11. If you right-click the new login and select Properties, you will see the same screen and details as we saw when we created the login graphically.
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Figure 4-11. Both logins created 5. We can then give the login access to SQL Server or disable it by using the ALTER LOGIN command. It is also possible to alter the login s default database. In our graphical example, if you check back to Figure 4-5, you will see that the default database was called master. It would be better for the login to connect to the correct database. The following code informs SQL Server that it should connect our login to the ApressFinancial database by default, rather than the master database as defined previously. Remember to change the prefix as appropriate: ALTER LOGIN [FAT-BELLY\Apress_Product_Controllers] WITH DEFAULT_DATABASE=ApressFinancial 6. The final piece in the jigsaw is to grant the Windows account access to the database, which will then allow the login to use the ApressFinancial database. To do this, we need to switch from the master database to the ApressFinancial database with the USE keyword followed by the name of the database. Using CREATE USER, we can then specify the name of the user we want in our database. The standard procedure is to use the same name as the login, which makes life so much easier when maintaining the system in general. We then use FOR LOGIN to define which server login we want to map to this database user: USE ApressFinancial GO CREATE USER [FAT-BELLY\Apress_Client_Information] FOR LOGIN [FAT-BELLY\Apress_Client_Information] GO
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As you now know, there are two steps to complete, whether you want to create a SQL Server authentication based login or a Windows authentication based login. The first is a server login, which was the first part of creating a login that we went through. A server login is one that, when used, can connect only to the server itself. It cannot use any of the user databases within SQL Server. The second step was creating the database user; in the graphical section that we looked at first, this is when we selected the databases we wanted to use. Within SQL Server, permissions can be granted at multiple levels, including the server and database level. Examples of server-level permissions include creating new logins or managing server properties. Examples of database permissions include being able to read data from a table or being able to create new tables. One server login can be associated with multiple users in different databases. Generally, when using Windows authentication, a database username is the same as the login name, but this does not have to be the case. It does, however, simplify administration. In this book, we will mostly be dealing with database-level permissions, but we will briefly examine server roles in the following section.
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