Microsoft KB Archive/294872

= FIX: Update on a Table with INT and BIT Columns May Zero Out INT Columns =

Article ID: 294872

Article Last Modified on 11/5/2003

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APPLIES TO


 * Microsoft SQL Server 2000 Standard Edition

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This article was previously published under Q294872



BUG #: 352839 (SHILOH_BUGS)



SYMPTOMS
A table that was created with int columns, which appear somewhere after a bit column, may have the int columns zeroed out when other columns in the table are updated.



RESOLUTION
To resolve this problem, obtain the latest service pack for SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

290211 INF: How to Obtain the Latest SQL Server 2000 Service Pack



WORKAROUND
To work around this problem, either:
 * Put all of the bit columns at the end when you create a table.

-or-


 * Change the data type for the bit columns to tinyint.



STATUS
Microsoft has confirmed that this is a problem in SQL Server 2000. This problem was first corrected in SQL Server 2000 Service Pack 1.



MORE INFORMATION
To reproduce the problem, use the code that follows.

Removing any of the columns or changing the data types of the BIT columns prevents the problem from occurring. In the following example the integer columns are set to zero even though they are not included in the SET clause of the update. CREATE TABLE [dbo].[BitTest] ( [KeyID] [int] NOT NULL, [Promote] [bit] NULL , [IntegerA2] [int] NULL , [IntegerB2] [int] NULL , [IntegerX2] [int] NULL , [IntegerY2] [int] NULL , [IntegerZ2] [int] NULL , [P2State] [int] NULL , [C1State] [int] NULL , [P1EntityName] [varchar] (50)  NULL, [P1FirstName] [varchar] (25)  NULL, [P1MiddleInitial] [varchar] (1) NULL , [P1LastName] [varchar] (35)  NULL , [P1Address1] [varchar] (35)  NULL , [P1Address2] [varchar] (35)  NULL , [P1Address3] [varchar] (35)  NULL , [P1City] [varchar] (30)  NULL , [P1SSN] [varchar] (9)  NULL , [P1Percent] [varchar] (3)  NULL , [P1Cancel] [bit] NULL , [P1Allowed] [bit] NULL , [P2EntityName] [varchar] (50)  NULL, [P2FirstName] [varchar] (25)  NULL, [P2MiddleInitial] [varchar] (1) NULL , [P2LastName] [varchar] (35)  NULL , [P2Address1] [varchar] (35)  NULL , [P2Address2] [varchar] (35)  NULL , [P2Address3] [varchar] (35)  NULL , [P2City] [varchar] (30) NULL , [P2ZIP] [varchar] (15) NULL , [P2SSN] [varchar] (9) NULL , [P2Percent] [varchar] (3) NULL , [P2Cancel] [bit] NULL , [P2Allowed] [bit] NULL , [C1EntityName] [varchar] (50) NULL, [C1FirstName] [varchar] (25) NULL, [C1MiddleInitial] [varchar] (1) NULL , [C1Address1] [varchar] (35) NULL , [C1Address2] [varchar] (35) NULL , [C1Address3] [varchar] (35) NULL , [C1City] [varchar] (30) NULL , [C1Cancel] [bit] NULL , [C1Allowed] [bit] NULL , [C2EntityName] [varchar] (50) NULL, [C2Address3] [varchar] (35) NULL , [C2Percent] [varchar] (3) NULL , [C2Cancel] [bit] NULL , [C2Allowed] [bit] NULL , [IntegerC2] [int] NULL, [col1] bit NULL ) GO insert BitTest (KeyID,IntegerA2,IntegerB2,IntegerZ2,IntegerC2)    values (101, 4, 4, 4, 4) GO Select  IntegerA2,IntegerB2,IntegerZ2,IntegerC2 From  BitTest GO Update  BitTest set   C2Allowed = null, Promote = null, P1EntityName = null, P2EntityName = null, C1EntityName = null, C2EntityName = null, C1Address3 = null, P1Address3 = null, P2Address3 = null, C2Address3 = null, P1FirstName = 'FirstName', P1MiddleInitial = null, P1LastName = 'LastName', P1Address1 = null, P1Address2 = null, P1City = null, P1SSN = '555555555', P1Percent = null, P2FirstName = null, P2MiddleInitial = null, P2LastName = null, P2Address1 = null, P2Address2 = null, P2City = null, P2State = null, P2SSN = null, IntegerX2 = null, P2Percent = null, C1FirstName = null, C1MiddleInitial = null, C1Address1 = null, C1Address2 = null, C1City = null, C1State = null, P2ZIP = null GO Select  IntegerA2,IntegerB2,IntegerZ2,IntegerC2 From BitTest GO

Additional query words: incorrect results, truncate, wrong data

Keywords: kbbug kbfix kbsqlserv2000sp1fix KB294872

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