SQL SERVER – Find Gaps in The Sequence

14 years ago

I have previously written two articles on the subject of missing identity and both are very well received by community. I had great fun to write article as many SQL Server expert participated in both the articles. Expert Imran Mohammed had provided excellent script to find missing identity. Please read both the articles for additional information before reading this article about finding gaps in the sequence.

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Well what really interesting is that another user asked similar question to find gaps in sequence. Two different expert Brian and Tejas responded with excellent solution. Let us go over questions and their solutions.

Question by Enrico

Hi Pinal/Folks,

Can anyone please help me? I am stunned at this one.

Let’s say I have the following records:

INV0096
INV0097
INV0099
INV0100
INV0102
INV0103

How can I generate a SQL Script that will show me the gaps in the sequence?

In such a way that the results will give me INV0098 and INV0101.
Or even just the number 98, and 101.

Thank you so much for your time.

Best regards,

Enrico

First Solution by Brian Tkatch

/*
Brian Tkatch Solution 1
*/
WITH
Data(Datum)
AS
(
SELECT 'INV0096' UNION ALL
SELECT 'INV0097' UNION ALL
SELECT 'INV0099' UNION ALL
SELECT 'INV0100' UNION ALL
SELECT 'INV0102' UNION ALL
SELECT 'INV0103'
),
CTE
AS
(
SELECT
CAST(SUBSTRING(MIN(Datum), 4, 4) AS INT) Start,
CAST(SUBSTRING(MAX(Datum), 4, 4) AS INT) Finish
FROM
Data
UNION ALL
SELECT
Start + 1,
Finish
FROM
CTE
WHERE
Start &amp;lt; Finish
)
SELECT
Common.Formatted
FROM
CTE
CROSS APPLY(SELECT 'INV' + 
RIGHT('0000' + CAST(Start AS VARCHAR(4)), 4)) Common(Formatted)
WHERE
NOT EXISTS
(
SELECT
*
FROM
Data
WHERE
Data.Datum = Common.Formatted
)
OPTION
(MAXRECURSION 0);

Second Solution by Brian Tkatch

/*
Brian Tkatch Solution 2
The CROSS APPLY is just nice, but not required. 
Without it, the query is very similar:
*/
WITH
Data(Datum)
AS
(
SELECT 'INV0096' UNION ALL
SELECT 'INV0097' UNION ALL
SELECT 'INV0099' UNION ALL
SELECT 'INV0100' UNION ALL
SELECT 'INV0102' UNION ALL
SELECT 'INV0103'
),
CTE
AS
(
SELECT
CAST(SUBSTRING(MIN(Datum), 4, 4) AS INT) Start,
CAST(SUBSTRING(MAX(Datum), 4, 4) AS INT) Finish
FROM
Data
UNION ALL
SELECT
Start + 1,
Finish
FROM
CTE
WHERE
Start &amp;lt; Finish
)
SELECT
'INV' + RIGHT('0000' + CAST(Start AS VARCHAR(4)), 4)
FROM
CTE
WHERE
NOT EXISTS
(
SELECT
*
FROM
Data
WHERE
Data.Datum = 'INV' + RIGHT('0000' + CAST(Start AS VARCHAR(4)), 4)
)
OPTION
(MAXRECURSION 0);

Third Solution by Tejas Shah

/*
Tejas Shah Solution 3
*/
DECLARE @Test TABLE (Data VARCHAR(10))
INSERT INTO @test
SELECT 'INV0096'
UNION ALL
SELECT 'INV0097'
UNION ALL
SELECT 'INV0099'
UNION ALL
SELECT 'INV0100'
UNION ALL
SELECT 'INV0102'
UNION ALL
SELECT 'INV0103'
UNION ALL
SELECT 'INV0106'
UNION ALL
SELECT 'INV0110'
;WITH cte1 AS(
SELECT CAST(RIGHT(Data,4) AS INT) AS RowID
FROM @Test
), Missing AS(
SELECT MIN(RowID) AS MissNum,
MAX(RowID) AS MaxID
FROM Cte1
UNION ALL
SELECT MissNum + 1,
MaxID
FROM Missing
WHERE MissNum &amp;lt; MaxID
)
SELECT missnum
FROM Missing
LEFT JOIN cte1 tt ON tt.Rowid = Missing.MissNum
WHERE tt.Rowid IS NULL
OPTION (MAXRECURSION 0);

Let me know if you know any other trick to achieve the same.

Reference : Pinal Dave (https://blog.sqlauthority.com)

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16 Comments. Leave new

Luca Zavarella
September 6, 2009 5:59 pm
DECLARE @Data TABLE (Datum VARCHAR(10));
INSERT INTO @Data
SELECT ‘INV0096’
UNION ALL
SELECT ‘INV0097’
UNION ALL
SELECT ‘INV0099’
UNION ALL
SELECT ‘INV0100’
UNION ALL
SELECT ‘INV0102’
UNION ALL
SELECT ‘INV0103’
UNION ALL
SELECT ‘INV0106’
UNION ALL
SELECT ‘INV0110’;
WITH DataInt(Item)
AS
(
SELECT CAST(SUBSTRING(Datum, 4, 4) AS INT)
FROM @Data
),
Nbrs_3( n ) AS ( SELECT 1 UNION SELECT 0 ),
Nbrs_2( n ) AS ( SELECT 1 FROM Nbrs_3 n1 CROSS JOIN Nbrs_3 n2 ),
Nbrs_1( n ) AS ( SELECT 1 FROM Nbrs_2 n1 CROSS JOIN Nbrs_2 n2 ),
Nbrs_0( n ) AS ( SELECT 1 FROM Nbrs_1 n1 CROSS JOIN Nbrs_1 n2 ),
Nbrs ( n ) AS ( SELECT 1 FROM Nbrs_0 n1 CROSS JOIN Nbrs_0 n2 ),
Integers (n)
AS
(
SELECT D.n
FROM ( SELECT ROW_NUMBER() OVER (ORDER BY n)
FROM Nbrs ) AS D(n)
WHERE D.n >= (SELECT MIN(Item)
FROM DataInt)
AND D.n <= (SELECT MAX(Item)
FROM DataInt)
)
SELECT Integers.*
FROM DataInt
RIGHT JOIN Integers
ON DataInt.Item = Integers.n
WHERE DataInt.Item IS NULL
Reply
Ashish
September 7, 2009 11:28 am
not the best way but this is also working
DECLARE @Test TABLE (Data VARCHAR(10))
INSERT INTO @test
SELECT ‘INV0096’
UNION ALL
SELECT ‘INV0097’
UNION ALL
SELECT ‘INV0099’
UNION ALL
SELECT ‘INV0100’
UNION ALL
SELECT ‘INV0102’
UNION ALL
SELECT ‘INV0103’
UNION ALL
SELECT ‘INV0106’
UNION ALL
SELECT ‘INV0110′
select number from master..spt_values where
number not in (select right(data,4) from @test) and
number between (select min(right(data,4)) from @test)
and (select max(right(data,4)) from @test) and TYPE=’P’
Reply
fly
September 8, 2009 12:02 pm
declare @tbl table (data varchar(10))
insert into @tbl
select ‘inv0096’
union all
select ‘inv0097’
union all
select ‘inv0099’
union all
select ‘inv0100’
union all
select ‘inv0102’
union all
select ‘inv0103’
union all
select ‘inv0106’
union all
select ‘inv0110’
declare @i int
select @i = 0
declare @integer table(i int)
while @i < 1000
begin
insert into @integer(i) select @i
select @i = @i + 1
end
select i
from @integer
left join @tbl on i = cast(right(data, 4) as int)
where data is null
and i = (select min(cast(right(data, 4) as int)) from @tbl)
Reply
fly
September 8, 2009 12:03 pm
sorry,
but < and > disappeared
where clause
where data is null
and i <= (select max(cast(right(data, 4) as int)) from @tbl)
and i >= (select min(cast(right(data, 4) as int)) from @tbl)
Reply
K K Rakesh Varma
September 9, 2009 7:26 pm
declare @Org_tab table (string varchar(100))
declare @Comp_tab table (Comp_value int)
declare @min int,@max int,@i int
insert into @Org_tab
select ‘INV0096’
union all
select ‘INV0097’
union all
select ‘INV0099’
union all
select ‘INV0100’
union all
select ‘INV0102’
union all
select ‘INV0103’
set @min=(select min(cast(substring(string,4,4) as int)) from @Org_tab)
set @max=(select max(cast(substring(string,4,4) as int)) from @Org_tab)
while @min <= @max
begin
insert into @Comp_tab(Comp_value) select @min
select @min = @min + 1
end
select distinct Comp_value from @Comp_tab,@Org_tab
where Comp_value not in (select cast(substring(string,4,4) as int) from @Org_tab)
Reply
jyoti
September 18, 2009 7:14 pm
declare
c2 cursor for select data from test
declare
@varStrings varchar(50),
@i int
begin
open c2
fetch c2 into @varStrings
set @i=96
while @@fetch_status=0
begin
if cast(substring(@varStrings,4,4) as int) @i
begin
select ‘inv’+cast(@i as varchar)
set @i=@i+2
end
else
begin
set @i=@i+1
end
fetch c2 into @varStrings
end
close c2
deallocate c2
end
Reply
Rajesh S
March 12, 2010 5:33 pm
Hi Dave,
DECLARE @test Table(InvOID varchar(10))
INSERT INTO @test
VALUES(‘INV0096’),(‘INV0097’),(‘INV0100’)
DECLARE @MinOID INT
DECLARE @MaxOID INT
SELECT @MinOID = MIN(CONVERT(INT,SUBSTRING(InvOID,4,4))) FROM @test
SELECT @MaxOID = MAX(CONVERT(INT,SUBSTRING(InvOID,4,4))) FROM @test
WHILE(@MinOID <= @MaxOID)
BEGIN
IF NOT EXISTS(SELECT 1 FROM @test WHERE InvOID = 'INV'+ RIGHT('0000'+CONVERT(VARCHAR(4),@MinOID),4))
BEGIN
SELECT 'INV'+CONVERT(VARCHAR(4),@MinOID)
END
SET @MinOID = @MinOID + 1
END
Cheers,
Rajesh S
Reply
Jerry Hung II
March 30, 2012 7:05 pm
I thing article machine should slow down a bit, and should not race for SEO. .. Its important to validate your solution.
The great article factory
Reply
Jerry Hung II
March 30, 2012 7:26 pm
Try something like this, easy way of getting things done
SET NOCOUNT ON
IF OBJECT_ID(‘tempdb..#tempInvoiceNumbers’) IS NOT NULL
DROP TABLE #tempInvoiceNumbers
CREATE TABLE #tempInvoiceNumbers
(InvoiceNumbers INT)
DECLARE @minInvoiceNumber INT
DECLARE @maxInvoiceNumber INT
DECLARE @index INT
SET @minInvoiceNumber =(SELECT MIN (InvoiceNumber) FROM dbo.BillHeaders)
SET @maxInvoiceNumber =(SELECT MAX(InvoiceNumber) FROM dbo.BillHeaders)
SET @index = @minInvoiceNumber
WHILE @index != @maxInvoiceNumber
BEGIN
INSERT INTO #tempInvoiceNumbers
( InvoiceNumbers )
VALUES ( @index )
SET @index=@index+1
END
SELECT I.InvoiceNumbers, dbo.BillHeaders.InvoiceNumber FROM #tempInvoiceNumbers AS I
LEFT JOIN dbo.BillHeaders ON InvoiceNumbers= dbo.BillHeaders.InvoiceNumber
WHERE dbo.BillHeaders.InvoiceNumber IS NOT NULL
Reply
Marc Vilsmeyer
April 24, 2012 7:53 am
Rajesh S
ROCKS!
Reply
zbsyed
June 18, 2012 9:42 pm
I’m using following code to to find out missing sequence in part transactiion ID from a table parttransactions anything above 6000000. To some reason when I execute this code I don’t get any result but I get message says “Query has finished processing” . Any advice what I’m missing?
declare @min int
declare @max int
create table #ZS (tempID int)
select @min = min(imtPartTransactionID), @max = max(imtPartTransactionID) from PartTransactions where imtPartTransactionID > 6000000
while @min <= @max
begin
if not exists (select * from PartTransactions where imtPartTransactionID = @min)
insert into #ZS (tempID) values (@min)
set @min = @min + 1
end
select * from #ZS
drop table #ZS
Reply
Radek K
January 7, 2013 4:15 pm
Rajesh S’ a bit more perfectionist version :P
– briliant simplicy Rajesh! I really liked your idea.
— insert test data
INSERT INTO @test
VALUES(‘INV0096’),(‘INV0097’),(‘INV0100’),(‘INV0101’),(‘INV0103’),(‘INV0104’)
— find min and max number from the range
DECLARE @MinOID INT
DECLARE @MaxOID INT
SELECT @MinOID = MIN(CONVERT(INT,SUBSTRING(InvOID,4,4))) FROM @test
SELECT @MaxOID = MAX(CONVERT(INT,SUBSTRING(InvOID,4,4))) FROM @test
— loop through all table rows
WHILE(@MinOID <= @MaxOID)
BEGIN
IF NOT EXISTS(SELECT 1 FROM @test WHERE InvOID = 'INV'+ RIGHT('0000'+CONVERT(VARCHAR(4),@MinOID),4))
BEGIN
SELECT 'INV' + REPLICATE('0',4-LEN(CONVERT(VARCHAR(4),@MinOID))) + CONVERT(VARCHAR(4),@MinOID)
END
SET @MinOID = @MinOID + 1
END
Reply
Sandeep Kumar Kamboj
June 14, 2013 9:59 am
create table #temp
(
ID int identity(1,1),
Name varchar(10)
)
insert into #temp(Name) Values(‘nikunj’)
insert into #temp(Name) Values(‘sandeep’)
insert into #temp(Name) Values(‘ajay’)
insert into #temp(Name) Values(‘rohit’)
insert into #temp(Name) Values(‘vishal’)
insert into #temp(Name) Values(‘vipin’)
insert into #temp(Name) Values(‘mohit’)
insert into #temp(Name) Values(‘sumit’)
insert into #temp(Name) Values(‘dev’)
insert into #temp(Name) Values(‘vicky’)
–select * from #temp
delete from #temp where ID in (1,4,6,9,10)
–select * from #temp
;with cte as (
select cast(IDENT_SEED(‘#temp’) as int) as ‘RowNo’
union all
select RowNo+cast(IDENT_INCR(‘#temp’) as int) as ‘RowNo’
from cte
where RowNo<cast(IDENT_CURRENT('#temp') as int)
)
select a.RowNo
from cte a
left outer join #temp b on a.RowNo=b.ID
where b.ID is null
drop table #temp
Reply
Tarni
November 27, 2013 6:04 pm
How about the below Query
create table temp
(
id int identity(1,1),
ids int
);
insert into temp values(2)
go 1000
delete from dbo.temp WHERE ID IN(2,5,7,10,34,65,78,90,123,456)
delete from dbo.temp where id in(7,10,34,65,78,90,123,456)
SELECT a.ID+1 FROM TEMP A
LEFT JOIN TEMP B
ON A.ID+1=B.ID
WHERE B.ID IS NULL
Remove the Last number as it will be an extra record.
Reply
Murali Krishna
December 10, 2015 10:26 am
Hi, The solutions Provided here were nice. But here in example you took all the values have prefix ‘INV’. If suppose one of the values do not have prefix ‘INV’ just the number. So like this
‘INV0096′,’INV0097′,’INV0100′,’0103’.. How about this??
Reply
Minhaj Raheem
October 14, 2016 5:43 pm
I think using REPLACE instead of SUBSTRING(MIN(Datum), 4, 4) will cover that up
Reply