Every one of us at least once had to deal with such predicament when someone accidently deletes a table without any backup to recover it. Even though you have deleted the table, you can still access the pages that are used until they get overwritten by other SQL transactions...
The Advantages of Converting from MS Access to SQL Server is that the performance, and processing time are all significantly improved.
A better solution will have a separate table so you can generate Invoice numbers. This way you let IDENTITY field work for you with any Insert as shown in the below Stored Procedure.
Microsoft changed the Identity behavior to jump in increment of 1000 or 10000 whenever the SQL Server 2012 restart. For example: we have a Primary Key that was 10012, if you re-start the SQL server instant, then in the next Insert record you will get the Primary Key as 11012.
Running any program and dealing with the UAC could be a hassle and that process also evaluates if the user has the rights to proceed with the program any further. If you need to remove the below UAC and save you the additional click then follow some basic steps to accomplish just that.
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When developing solutions that require querying large amount of data, you may want to consider user Stored Procedures. When accessing multiple "query patterns", you want to program your system to use the most efficient algorithm to return your data to the user. While using dynamic SQL may work for small databases, a preferred method would be to use a Stored Procedure to optimize performance.