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Figure 2-24 shows a command prompt window with a sqlcmd session. The session starts by invoking the sqlcmd.exe with the S switch. The instance name references the SQLEXPRESS instance on the local server. This statement attempts to connect via Windows authentication, which is the default authentication route for sqlcmd. After the login completes, the session continues by running a simple query. This task confirms that the connection is operational. Three additional sqlcmd statements on lines 1>, 2>, and 3> return a result set with the value of the number of salespersons in the SalesPerson table within the Sales schema of the AdventureWorks database. The result set appears after the GO keyword, which launches the current batch of statements and readies sqlcmd for a new batch. The 1> prompt that appears after the result set shows sqlcmd is ready to start a new batch of statements. The EXIT keyword closes the sqlcmd session and returns control to the operating system command prompt window.

3. Enter the sqlcmd command quit to exit sqlcmd (see Figure 1-17).

You use the SELECT statement to retrieve data from SQL Server. T-SQL requires only the word SELECT followed by at least one item in what is called a select-list. If SQL Server Management Studio is not running, go ahead and start it. When prompted to connect to SQL Server, enter the name of the SQL Server instance you installed while reading 1 or the name of your development SQL Server. You will need the AdventureWorks2008 sample databases installed to follow along with the examples and to complete the exercises. You will find instructions for installing the sample databases in 1.

Figure 2-24. You only need to specify the server instance name to connect from sqlcmd with Windows authentication.

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s Note We don t cover sqlcmd further, because we submit SQL with SSMSE, but we recommend you play with it. It s the latest command-line tool for SQL Server, superseding the earlier osql and isql tools, and it s still a valuable tool for database administrators and programmers.

When using SQL Server authentication, you need to specify a login name and its password Most database applications refer to a login name with userID or userid Therefore, sqlcmd names its switch for the login name -U There are several ways to specify the password for a login For example, there is a -P switch for designating the password value when you invoke sqlcmd However, sqlcmd shows your password in clear text so that anyone who can view your screen can learn your password Another approach is to omit the -P switch when connecting with SQL Server authentication In this scenario, sqlcmd prompts for the password after processing the sqlcmd statement but before granting access to a server instance When you type your password into the prompt, no onscreen feedback appears Thus, your password remains secure from those who can view your screen.

When you installed the creation script, the installer created not only a folder but also an application, Microsoft SQL Server 2000 Sample Database Scripts. You don t need this anymore, so you can remove it with Add or Remove Programs from the Control Panel.

Figure 2-25 shows the syntax for a sqlcmd session using SQL Server authentication The session uses the sa login Notice that you still need to specify a server instance name with the -S switch In addition, you need to designate a login name, which is sa, in the figure The sqlcmd statement syntax without a P switch causes the Password: prompt A user must enter a valid password for the login specified with the -U switch before the sqlcmd utility permits access to the server The display of the 1> prompt after the Password: prompt confirms the granting of server access Although you must enter a valid password to get to the 1> prompt, no password shows on the screen Figure 2-25 demonstrates the use of the :serverlist keyword Recall that this statement returns a list of visible SQL Server instances.

Perhaps the simplest form of a SELECT statement is that used to return a literal value that you specify. Begin by clicking New Query to open a new query window. Listing 2-1 shows two SELECT statements that

If you are not sure of an instance name or you want to confirm that an instance is broadcasting its availability, this command is very convenient The command executes automatically so there is no need for the GO keyword The figure concludes with the EXIT keyword, which closes the sqlcmd session..

Summary

Figure 2-25. By not using the -P switch with SQL Server authentication, you can secure your password from those who can view your screen.

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