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For example, if there are five rows and five columns in table A and ten rows and three columns in table B, the cross join of A and B would produce a table with fifty rows and eight columns This join operation is not only virtually inapplicable to any real-world query, but it s also a potentially very expensive process for even small real-world databases (Imagine using it for production tables with thousands or even millions of rows).

Writing the VB code to use a connection is usually the easy part of getting a connection to work. Problems often lie not in the code, but rather in a mismatch in the connection parameters between the client (your VB program) and the database server. All appropriate connection parameters must be used and must have correct values. Even experienced database professionals often have problems getting a connection to work the first time. More parameters are available than the ones shown here, but you get the idea. A corollary of Murphy s Law applies to connections: if several things can go wrong, surely one of them will. Your goal is to check both sides of the connection to make sure all your assumptions are correct and that everything the client program specifies is matched correctly on the server. Often the solution is on the server side. If the SQL Server instance isn t running, then the client will be trying to connect to a server that doesn t exist. If Windows Authentication isn t used and the user name and password on the client don t match the name and password of a user authorized to access the SQL Server instance, then the connection will be rejected. If the database requested in the connection doesn t exist, an error will occur. If the client s network information doesn t match the server s, then the server might not receive the client s connection request, or the server response might not reach the client.

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For connection problems, using the debugger to locate the line of code where the error occurs usually doesn t help the problem almost always occurs on the call to the Open method. The question is, why You need to look at the error message. A typical error is as follows:

Summary

FTP data FTP commands SSH SMTP DNS WWW Kerberos authentication POP3 RPC (used by NFS) SQL databases NTP Time NetBIOS ports (used by the Samba server) IMAP SNMP (network management) Unsecure LDAP HTTPS NCP (used by some native Novell services like eDirectory) Secure LDAP

The cause for this is either using an invalid parameter or value, or misspelling a parameter or value in your connection string. Make sure you ve entered what you really mean to enter. Figure 5-2 showed probably the most common error message when trying to connect to SQL Server. In this case, most likely SQL Server simply isn t running. Restart the SSE service with net start mssql$sqlexpress. Other possible causes of this message are as follows: The SQL Server instance name is incorrect. For example, you used .\sqlexpress, but SSE was installed with a different name. It s also possible that SSE was installed as the default instance (with no instance name) or is on another machine (see the next section); correct the instance name if this is the case. The SSE program hasn t been installed go back to 1 and follow the instructions there for installing SSE. A security problem your Windows login and password aren t valid on the server. This is unlikely to be the problem when connecting to a local SSE instance, but it might happen in trying to connect to a SQL Server instance on another server. A hardware problem again unlikely if you re trying to connect to a server on the same machine.

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