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Although possible, having two tables of the same name but different owners is not recommended, as it causes confusion.
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Let s look at the INTO statement in action.
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Try It Out: SELECT INTO
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1. In an empty Query Editor window, enter the following code: SELECT CustomerFirstName + ' ' + CustomerLastName AS [Name], ClearedBalance,UnclearedBalance INTO CustTemp FROM CustomerDetails.Customers 2. Execute the code. This will return the following message in the results pane:
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(5 row(s) affected)
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CHAPTER 8 WORKING WITH THE DA TA
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3. If we now move to Object Explorer on the left-hand side (if Object Explorer is no longer there, press F8) and complete a refresh, you should see a new table in the expanded Tables node, called dbo.CustTemp, as shown in Figure 8-34.
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Figure 8-34. New table created with SELECT INTO You should use the INTO clause with care. For instance, in this example, security has not been set up for the table, and we are also creating tables within our database that have not been through any normalization or development life cycle. It is also very easy to fill up a database with these tables if we are not careful. However, it is a useful and handy method for taking a backup of a table and then working on that backup while testing out any queries that might modify the data. Do ensure, though, that there is enough space within the database before building the table if you do use this technique.
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Note It is best to avoid using SELECT INTO in a production environment unless you really do need to keep the table permanently. If you do need to build a temporary table, then you may wish to use tempdb by writing your INTO clause as INTO tempdb..CustTemp.
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Who Can Add, Delete, and Select Data
In this chapter, we inserted a certain amount of data into tables. All went well, and the data was inserted and selected easily. This was due to using the same connection that created the database. This does not mean that anyone who has access to our database could also add data as easily as we can. In 1, we set up several different users for the system. To recap, here are the users and their authority: RDewson: Administrator/database owner JThakur: Database owner VMcGlynn: Administrator sa: Administrator, SQL Server s default system administrator login We want to prove that not all users can or should be able to do anything against our data. If any new user is created and given authority to connect to ApressFinancial, then providing this user is not an administrator on the local machine, he or she will not be able to view, insert, or delete any data. We do have a limited user in JThakur, although we did give this user db_owner rights earlier in the book to demonstrate his connection. This was a short-term solution that is now no longer is valid.
CHAPTER 8 WORK IN G WITH THE DA TA
We need to refine this user so that we can restrict exactly what the user can do. In the following example, we will remove the db_owner role and give JThakur SELECT permissions on the ShareDetails.Shares table only. You will then see this in action.
Try It Out: Refining Permissions
1. Within Object Explorer, expand the Security node, and then the Users node. Find FAT-BELLY\JThakur, right-click it, and select Properties. 2. This will bring up the Database User dialog box. As shown in Figure 8-35, deselect the db_owner role that you will see as being checked.
Figure 8-35. Removing database owner role 3. Move to the Securables options for this user. In this area, shown in Figure 8-36, it is possible to define the exact privileges that this user can have, and can even pass on to other users. At present, the options are blank, but we can add objects by clicking the Add button.
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