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POSQL Where Exists Doesn't Filter?
 

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  1. POSQL Where Exists Doesn't Filter?
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    <blockquote> <p>System.Data.SqlClient.SqlException (0x80131904): Violation of UNIQUE KEY constraint 'AK_SeqNo'. Cannot insert duplicate key in object 'dbo.SeqNo'.</p> </blockquote> <p>I get the above SQL Server 2005 Express error randomly. Maybe once every 3 weeks from the stored procedure below. Can anyone see why?</p> <pre><code>CREATE PROCEDURE [dbo].[mspResetSeqNo] @Today DATETIME AS BEGIN SET NOCOUNT ON; DECLARE @DateSrc DATETIME DECLARE @MyGUID UNIQUEIDENTIFIER -- Check Input is Valid IF @Today IS NULL BEGIN RAISERROR (N'@Today cannot be NULL', 10, 1); RETURN 1; END -- Chop off the time part: SET @DateSrc = DATEADD(d, 0, DATEDIFF(d, 0, @Today)); -- Get Current Location GUID SET @MyGUID = dbo.MyGUID(); -- If this is the first entry for the day then initialise INSERT INTO dbo.SeqNo(MyGUID, TheDay, LastNo) SELECT @MyGUID, @DateSrc, 0 WHERE NOT EXISTS ( SELECT 1 FROM dbo.SeqNo AS sn WHERE sn.MyGUID = @MyGUID AND sn.TheDay = @DateSrc ); RETURN(0); END </code></pre> <p>The constraint for AK_SeqNo is:</p> <pre><code>ALTER TABLE [dbo].[SeqNo] ADD CONSTRAINT [AK_SeqNo] UNIQUE NONCLUSTERED ( [TheDay] ASC, [MyGUID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] </code></pre> <p>The table column for those 2 data types are:</p> <pre><code>[MyGUID] [dbo].[DForeignKey] NOT NULL, [TheDay] [datetime] NOT NULL, </code></pre> <p>The user defined type DForeignKey is:</p> <pre><code>CREATE TYPE [dbo].[DForeignKey] FROM [uniqueidentifier] NULL </code></pre> <p>The MyGUID() function is simply retrieving the local system ID. Every location has a different ID.</p> <pre><code>CREATE FUNCTION [dbo].[MyGUID]() RETURNS uniqueidentifier AS BEGIN DECLARE @me as uniqueidentifier SELECT @me = MyGUID FROM Self RETURN @me END </code></pre>
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    1. COHow is the `AK_SeqNo` constraint defined?
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      1. USPinnyM
    2. COI've updated the message with those details.
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    3. COAre there any triggers on table dbo.SeqNo?
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      1. USIgor Borisenko
 

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