select * from @t where ID_Code in
(
select ID_Code from @t
where type in (‘A’,'B’)
group by ID_Code
having MIN(CreateDate)=MAX(CreateDate)
and COUNT(ID_Code)=2
)

ID_Code Type CreateDate
1 A 7/1/2011
1 B 7/5/2011
1 C 7/2/2011
2 A 7/12/2011
2 B 7/12/2011
2 D 7/14/2011
3 A 7/12/2011

Expected excluded data results should be this;

2 A 7/12/2011
2 B 7/12/2011
2 D 7/14/2011

SELECT @MaxID = [ID] FROM Missingids

SET @ID = 1
WHILE @ID <= @MaxID
BEGIN
IF NOT EXISTS (SELECT 'X' FROM Missingids
WHERE [ID] = @ID)
INSERT INTO @MissingCarTypeIDs ( [ID] )
VALUES ( @ID )

SET @ID = @ID + 1
END

SELECT * FROM @MissingCarTypeIDs

Declare @t table (ColId varchar (20))
insert into @t
Select ‘EC0001′ union all
Select ‘EC0012′

;With CTE as
(Select CAST(STUFF(MAX(ColId), 1,2,”) AS INT) colid from @t
union all
Select colid-1 colid from CTE where (colid-1)>=1 )
Select ‘EC’+ replicate(’0′,6-len(min(colid)))+cast(min(colid) as varchar) from CTE where
colid not in (Select stuff(colid,1,2,null) from @t)

–Create an table in which we can add identity and Values.
IF OBJECT_ID(‘tblNumbers’) IS NOT NULL
BEGIN
DROP TABLE tblNumbers
END

CREATE TABLE tblNumbers
(
ID INT IDENTITY(1,1) PRIMARY KEY,
VALUE VARCHAR(20)

)

–Create an table in which we can add numbers.
IF OBJECT_ID(‘tblAllNumbers’) IS NOT NULL
BEGIN
DROP TABLE tblAllNumbers
END

CREATE TABLE tblAllNumbers
(
NUMBER INT PRIMARY KEY

)
–Create an Number table upto 15,00,000
INSERT INTO tblAllNumbers

SELECT TOP 1500000 ROW_NUMBER() OVER(ORDER BY SC.ID) FROM sys.sysobjects SC , Sys.sysobjects SC1

DECLARE @int INT,@MaxRowXount INT

–Insert Row data into tblNumbers
SELECT @int = 1

WHILE @int 0

SELECT @MaxRowXount = MAX(ID) FROM tblNumbers

–Now Check for Missing Identity.

SELECT TA.NUMBER FROM tblAllNumbers TA LEFT JOIN tblNumbers TN

ON
TA.NUMBER = TN.ID

WHERE
TA.NUMBER <= @MaxRowXount AND
TN.ID IS NULL
ORDER BY
TA.NUMBER

Now I had a different problem that was solved by this script. I was trying to rebuild an entire database manually. Don’t ask why, I just had to do it. I was able to script out all of the tables, procedures, keys, functions, etc., and import all of the data. But I needed to know what tables in the source db had identity columns. This script gave me the answer. Excellent work!

SELECT ID+1 FROM Tablename T1
WHERE NOT EXISTS
( SELECT ID FROM Tablename T2 WHERE T2.ID = T1.ID+1 )

KISS, isn’t it?;)

// You may add additional check to exclude last value (it equals identcurrent for Tablename)

I couldn’t find any reason why we need to find out missing identity values. I have gone thru various forums but no luck.

Every SQL expert says Why do you care about missing values :D…

This discussion came not as a criticism to the ‘excellent’ script provided for download. But it was more focusing on a ‘learning’ excercise. IDENTITIES are discussed over a million times in SQL Server blogs. Though identities are looked as a trivial subject, it is not so. We once did a 1 hour Quiz session on IDENTITIES.

The discussion I started was with the intention to see if there are any REAL-LIFE example where a missing identity sequence can really create a problem.

regards
Jacob

1) Alternate way of this script.
2) Example where logic is dependent on identity column.

Kind Regards,
Pinal

Very nice comment Imran.

As you said, this can be for sure helpful to debug. I have personally once seen issue where someone was relying on identity to to assign them seats in events. In fact, it should be depending on Count(*).

One more example, I remember when one of the ID was missing and company owner’s superstitious nature was not happy with it.

Well, above two reasons does not quality but debugging for sure help out.

Again, writing script has nothing to do with expertise. We want to train our brain and that is why we try to solve puzzles.

Great work Imran! At present no one else has attempted to solve this puzzle.

Kind Regards,
Pinal

Thanks Pinal for keeping this script to download on your blog.

Thanks for those who actually saw this script and gave missed comments.

Now response for all above questions.

I do not want to show off, But to be honest, When I see a question posted in this blog, I don’t give a second thought, Why, What, When, Where …. NO, But I straight away start, working on the question.

Few Questions that I find very good and if I feel I developed a good script for such a question, then I sent that script to Pinal requesting him to publish.

For this specific question, I did not think why user needed this info, I found this question challenging and I gave a solution.

There could be many reasons to find out why we need this info, If you use Identity property as your most unique column and Transaction Identifier, then definitely you would want to know why few transaction did not completely, Is there any specific fashion these transaction fails (Can be found out looking at missing values of identity)….. Could be helpful to debug.

~ IM.