How to identify missing records in a single-column table?

How to identify missing records in a single-column table ?
Column consists of numbers in a ordered manner but the some numbers are deleted from the table in random manner and need to identify those rows.

Something like:
WITH t AS (
           SELECT 1 ID FROM DUAL UNION ALL
           SELECT 2 ID FROM DUAL UNION ALL
           SELECT 3 ID FROM DUAL UNION ALL
           SELECT 5 ID FROM DUAL UNION ALL
           SELECT 8 ID FROM DUAL UNION ALL
           SELECT 10 ID FROM DUAL UNION ALL
           SELECT 11 ID FROM DUAL
-- end of on-the-fly data sample
SELECT '[' || (id + 1) || ' - ' || (next_id - 1) || ']' gap
FROM (
         SELECT id,
                 lead(id,1,id + 1) over(order by id) next_id
           FROM t
where id != next_id - 1
GAP
[4 - 4]
[6 - 7]
[9 - 9]
SQL> SY.
P.S. I assume sequence lower and upper limits are always present, otherwise query needs a little adjustment.

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Hello,
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What I want to do is the following :
I have a table that contains images. Something like that :
Table images (id number, image blob).
Lets say that in this table I have scanned images of persons, invoices and orders.
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this table could be :
Table image_associations (imageid number, rowid_column varchar2(100))
The "rowid_column" would contain the rowid of the row that is associated with the image.
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What you are saying is you want to avoid theaccepted relational design theory and subvert the
fundamental principles of very model?
Yes !!!!Then you are very short sighted and will fail. Why would you want to do this? How is it that you think you are smarter than the forefathers of our industry? an idea so compelling that huge companies have many massive profits implementing the concepts? (sometimes even properly) and how is it that you imagine you can work outside the concepts underlying those tools, within the tool and come to a better solution? this is arrogance surely.
>
I think a lot of people use rowid to identify within
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As I can remember from my classrooms (a lot of years
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I have one table with many records in the table. Each time a record is entered the date the record was entered is also saved in the table.
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so if I have in my table:
ID          Date          Location
1           4/1/2015        bld1
2           4/2/2015        bld1
3           4/4/2015        bld1
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Do you have a table with all possible dates in it? You can do a left join from that to your above mentioned table where the right side of the join is null. If you don't have a table with all possible dates you could user a numbers table.
Below is one way to achieve what you want with a numbers table...
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DECLARE @RunDate datetime
SET @RunDate=GETDATE()
IF OBJECT_ID('dbo.Numbers') IS NOT NULL
DROP TABLE NUMBERS
SELECT TOP 10000 IDENTITY(int,1,1) AS Number
into Numbers
FROM sys.objects s1
CROSS JOIN sys.objects s2
ALTER TABLE Numbers ADD CONSTRAINT PK_Numbers PRIMARY KEY CLUSTERED (Number)
INSERT INTO @Table (ID, DateField, Location)
VALUES ('1','20150401','bld1')
,('1','20150402','bld1')
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as
SELECT DATEADD(dd,N.Number,D.StartDate) as Dates
FROM Numbers N
cross apply (SELECT CAST('20150101' as Date) as StartDate) as D
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Hi all,
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                DENSE_RANK() OVER (PARTITION BY was_no ORDER BY status_change_date) rank
         FROM   t)
GROUP BY appl_id,
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How to identify missing records in a single-column table?

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