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Figure 4-19. Schemas applied
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You have now created a database and gained an understanding of the different roles in SQL Server. Before you can proceed and create objects such as tables, you need to clear a couple of obstacles. After the database, the next objects you will create are tables, which you will learn about in the next chapter. So what security considerations do you need to check before you can do this First of all, you must be using a database user account that has the authority to add tables to the specific database you are required to, in this case ApressFinancial. This is the next security issue we will tackle, and you should keep in mind what you learned in the previous chapter about accounts and roles. You also need to have access to that specific database. Let s look at the issue of access to the database if you are using a user ID that did not create the database. The database was re-created at the very end of the previous chapter under user ID XP-PRO\RDewson. The user who created the database is the database owner, also known as dbo. So how can you check who created the database if you did not At the end of the last chapter, I asked you to create the database under your own user ID, which, if you followed the instructions so far and you are a local administrator of the machine SQL Server is installed on, you should have the right privileges within SQL Server to do. If you are working with SQL Server already installed on an XP/W2K(3) machine, you need to ensure that your user ID is set up as an administrator user ID, as demonstrated in 1, or set up specifically as an administrator within SQL Server. This next section will demonstrate how you check the identity of the database owner.
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Try It Out: Checking the Database Owner
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1. Ensure that SQL Server Management Studio is open. 2. Navigate to the database that you wish to check on, in this case ApressFinancial. 3. Click the ApressFinancial database node in the Object Explorer on the left-hand side of the screen once, and then right-click. 4. Select Properties to bring up the Database Properties dialog box shown in Figure 4-20. On the General tab, you will see an item named Owner. This is the fully qualified XP/Win2K account preceded by the domain or local machine name.
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Figure 4-20. Database Properties 5. Click Cancel to close this dialog box.
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Ownership of tables and other database objects is just as important. If you create a table using the same login ID as that which you created the database with, or use a logon ID that is a
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member of the sysadmin role that is also implicitly mapped to the dbo user in the database, the table will have a default schema of dbo. However, if you logged in with a different user ID, the table would have that user s default schema as the prefix to the table name, replacing the dbo prefix. Now that we know who the database owner is, it is up to that user, or another user who has system administration rights (in other words, a login that has the sysadmin server role or has the db_owner database role), to allow any other specified user the ability to create tables within the database. We have a user called AJMason who is not a system administrator, but a developer. Recall we created this user in 1, and that this user could not log in to SQL Server. The next section will go through a scenario where, as a developer, AJMason has no rights to create any new items. However, we will rectify this situation in the next section, where we will alter AJMason so that he can connect to SQL Server and create a table.
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