Symptoms
Assume that you use the Substring (expression, start, length) function in Microsoft SQL Server 2012 Service Pack 1 (SP1) Cumulative Update 1 (CU1) and later versions or SQL Server 2014. When the length of expression is larger than 8000 and start is larger than the length of expression, an access violation occurs. Additionally, you receive the following error:
A severe error occurred on the current command. The results, if any, should be discarded.
Resolution
The issue was first fixed in the following cumulative update of SQL Server. After the hotfix is applied, a zero-length expression is returned when start is greater than the number of characters in the value expression.
Cumulative Update 1 for SQL Server 2012 SP2 /en-us/help/2976982
Cumulative Update 2 for SQL Server 2014 /en-us/help/2967546
Cumulative Update 10 for SQL Server 2012 SP1 /en-us/help/2954099
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
