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CHAPTER 8 WORKING WITH THE DATA
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Using SQL Server Management Studio to Retrieve Data
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The first area that will be demonstrated is the simplest form of data retrieval, but it is also the least effective. Retrieving data using SQL Server Management Studio is a very straightforward process, with no knowledge of SQL required in the initial stages. Whether it has to return all rows, or even when you want to return specific rows, using SQL Server Management Studio makes this whole task very easy. This first example will demonstrate how flexible SQL Server Management Studio is in retrieving all the data from the CustomerDetails.Customers table.
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Try It Out: Retrieving Data Within SQL Server Management Studio
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1. Ensure that SQL Server Management Studio is running. Navigate to the ApressFinancial database and click the Tables node; this should then list all the tables in the right-hand pane. Find the Customers table, right-click it to bring up the pop-up menu we have seen a number of times before, and select Open Table. This instantly opens up a new Query Editor window pane like the one in Figure 8-13, which shows all the rows that are in the CustomerDetail.Customers table. But how did SQL Server get this data Let s find out.
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Figure 8-13. CustomerDetails.Customers table retrieving data 2. On the toolbar, you will see a button that, when pressed, will show the SQL code that was built to create this query:
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3. Clicking the button alters the screen to that shown in Figure 8-14. This is the SQL syntax generated by SQL Server Management Studio to provide the information requested. 4. On the right you might see a window called the Properties window. If you don t see the screen as shown in Figure 8-15, then you can open this up by pressing F4 or by clicking the View menu item. The point of interest at the moment is the section you see highlighted in Figure 2-21, Top Specification. Here we can enter the maximum number of records that we wish to return.
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CHAPTER 8 WORKING WITH THE DATA
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Figure 8-14. Output displayed via SQL Window
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Figure 8-15. Top Specification selected 5. The order of the records returned will be determined by the clustered index created on the table. However, if the table has no clustered index, then the order the records are returned in is arbitrary and there is no guarantee that the order will be the same when running the same query repeatedly. Changing Top Specification/(Top) to Yes will change the Properties window to as shown in Figure 8-16.
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Figure 8-16. Top Specification required 6. We can enter any number we choose in the Expression property, but for this first time at least, enter 3 in the Expression box. This will return a maximum of three rows. If we entered a value of 100, we would only get five rows returned, as that is the maximum number of rows in the table at this moment in time. You would use this perhaps when you don t know the number of records within a table, but you are only interested in a maximum number of 100 if there are more. This would be when you want to look at just a small selection of content in columns within a table. Now notice in the top-left hand corner of the results grid the following icon here. This indicates that you have changed a property of the query and you need to do a refresh.
CHAPTER 8 WORKING WITH THE DATA
7. Right-click a blank area of the results grid and you will see the pop-up menu shown in Figure 8-17.
Figure 8-17. Results grid pop-up menu 8. Click Execute SQL to change the results grid to return just three rows of data, as shown in Figure 8-18.
Figure 8-18. Three rows returned 9. Again, by clicking the SQL button on the toolbar, the SQL code is exposed. Notice how this differs from the previous example in that TOP (3) has been placed after the SELECT statement. SELECT FROM TOP (3) * CustomerDetails.Customers
So now that you know how to return data from SQL Server Management Studio, let s look at using T-SQL and probably the T-SQL statement you will use most often: the SELECT.
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