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When you are joining one or more columns of a view or entering data through a view, it can be useful to know the names, data types, and related kinds of information about the columns in a view The following SELECT statement joins the syscolumns and systypes views to report the data type for the columns in a view The syscolumns view contains information about the columns in all objects within a database Each row in the syscolumns view contains meta data about a column The object_id column in syscolumns denotes the parent data source, such as a table or a view, for the column The SELECT statement s WHERE clause includes a subquery that looks up the object identification number for the vSalePersonNamePhoneEmail view By matching the return value from the subquery with the object_id column in the sys.

1. The first test we will do is to try and detach ApressFinancial while there are still active connections so that we can see what happens. Open up a Query Editor pane and point it to ApressFinancial database. Then open a second pane and enter the sp_detach_db code as follows. Once you have done so, execute the code. Take note that we are explicitly moving this connection to a safe system database, away from the database we wish to detach. USE master GO sp_detach_db 'ApressFinancial' 2. The results you will see will be similar to the following: Msg 3703, Level 16, State 2, Line 1 Cannot detach the database 'ApressFinancial' because it is currently in use

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Figure 9-5. Our view with the columns selected 7. We are going to change the details in the column grid now to enforce sorting criteria and to give the column aliases. This means that if a user just does SELECT * from the view, then he or she will receive the data in the order defined by the view s query by default. It also means that some of the column names will have been altered from those of the underlying table. We want to ensure that the shares come out from the view in ascending name order. Move to the Sort Type column and click in the row that corresponds to ShareDesc. Select Ascending, as shown in Figure 9-6.

columns view, the SELECT statement extracts rows from syscolumns that are for columns in the vSalePersonNamePhoneEmail view The FROM clause performs a join between the syscolumns and systypes views The systypes view contains information about user-defined types and system types in a database The join has two criteria expressions combined with an AND operator The first expression evaluates equality between the system_type_id column values in syscolumns and systypes The second expression evaluates equality between the system_type_id and user_type_id column values in systypes This second expression excludes any rows from systypes for user-defined types that extend a system type Without this second expression, the result set can include multiple types for each column in the vSalePersonNamePhoneEmail view The SELECT list includes one item that references the name column from systypes.

3. Close the Query Editor pane opened earlier and any other Query Editor panes that have connections pointing to ApressFinancial and then try rerunning the code again. This time you should see the following message:

Figure 9-6. Placing an order on the data 8. In the next column, Sort Order, if we were defining more than one column to sort, we would define the order to sort the columns in. Select the value 1 in this value. However, we still need to add the aliases, which are found in the second column of the grid. Notice the third column, CurrentPrice. To make this column more user friendly, we make the name Latest Price, with a space. When we type this and tab out of the column, it becomes [Latest Price], as you see in Figure 9-7; SQL Server places the square brackets around the name for us because of the space.

This item looks up the data type name for the system_type_id value in the syscolumns view SELECT cname, tname 'data type', cmax_length, cis_identity FROM syscolumns c JOIN systypes t ON tsystem_type_id = csystem_type_id AND tsystem_type_id = tuser_type_id WHERE object_id = (SELECT OBJECT_ID('dbovSalePersonNamePhoneEmail', 'VIEW')) The result set for the preceding SELECT statement appears next Notice the data type column shows the name of the data type for the columns in the vSalePersonNamePhoneEmail view max_length defines the maximum width of a column in bytes The is_identity column returns a.

4. Now that the database has been detached, we need to reattach it, simulating a move to a new server. Enter in the same Query Editor pane the following code. Replace the FILENAME parameters with the path to where your database is located and ensure that the path is all on one line. CREATE DATABASE ApressFinancial ON (FILENAME='C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\ Data\ApressFinancial.MDF') FOR ATTACH 5. After executing the code, you should see the following message:

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