If you use Microsoft SQL Server 7.0 Service Pack 1 or Service Pack 2, and you use ISNULL as an expression that performs a divide by zero while the client has ANSI_WARNINGS set to OFF, the client disconnects. The errors that occur differ slightly depending on whether the client is ODBC, OLE DB or DB-Library-based. The ODBC and DB-Library errors follow.

ODBC Error: DB-Library Error:

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Set ANSI_WARNINGS to ON, or change the expression so that it will not encounter a divide by zero error.

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Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 3 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base: For more information, contact your primary support provider.

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For ODBC and OLE DB-based connections, ANSI_WARNINGS are set ON by default. For a DB-Library-based connection, the ANSI_WARNINGS option is set to OFF by default.

The following script demonstrates the problem:

use pubs
set ansi_warnings off
go

create table test(col1 int not null, col2 int not null)
insert test values(1,0)
go
select ISNULL(col1/col2, 0) from test
				

This script should return 0.

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