MS Access 2013 - Can I print missing sequence numbers on a report?

I have a simple table that has a field called nTagno.     The field is an inventory tag number.   I need to know if any of the nTagno numbers are missing.      For example, My tags are numbered 1000-1250 and the table is the records with tags 1101 through 1105.    I was trying to find a way to show that those tags are missing.  Either with a report or query.  The tag numbers are sequential but I just don't have a process for finding the missing tag numbers.    Any suggestions?
patrickmillerAsked:
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Nick67Commented:
There's a bunch of different ways.
You could create a new table, tblAllTags
Add to it nTagno with the sequential numbers 1000-1250.

You could then build a Find Unmatched Query to find those items in tblAllTags that aren't in your existing table.
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Rey Obrero (Capricorn1)Commented:
create a table with a single field [TagNo] name it myTags, and fill the field with all the tag numbers.
next create a query with a left join to your table

select [TagNo]
From myTags left join Table X
on mytags.tagno=tablex.[tagNumberfield]
where tablex.[tagNumberfield] is null

that should give you all the tag numbers that are missing in tableX
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Dale FyeCommented:
Generally, I use a special table (tbl_Numbers) with only a single field (lngNumber) and 10 records (the values 0-9) for this type of thing.  With this table, you can create a query that generates any sequence of numbers, starting at any value. So, to generate a table with 1000 values, ranging from 0 to 1000, you would create a query like:

SELECT Hundreds.lngNumber * 100 + Tens.lngNumber * 10 + Ones.lngNumber
FROM tbl_Numbers as Hundreds, tbl_Numbers as Tens, tbl_Numbers as Ones
ORDER BY Hundreds.lngNumber * 100 + Tens.lngNumber * 10 + Ones.lngNumber

Name this qry_Numbers.

Then, from this, you could create a query similar to the following, which gives you a list of numbers ranging from the minimum to the maximum of your tag numbers.

SELECT lngNumber + DMIN("nTagno", "yourTagNumberTable") as TagNo
FROM qry_Numbers
WHERE qry_Numbers.lngNumber + DMIN("nTagno", "yourTagNumberTable") <= DMAX("nTagno", "yourTagNumberTable")

And then, finally, convert the previous query to a subQuery and use a LeftJoin to identify the missing tag numbers, something like:

SELECT sq.TagNo
FROM (
SELECT lngNumber + DMIN("nTagno", "yourTagNumberTable") as TagNo
FROM qry_Numbers
WHERE qry_Numbers.lngNumber + DMIN("nTagno", "yourTagNumberTable") <= DMAX("nTagno", "yourTagNumberTable")
) as sq
LEFT JOIN yourTagNumberTable ON sq.TagNo = yourTagNumberTable.nTagNo)
WHERE yourTagNumberTable.nTagNo IS NULL
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Jeffrey CoachmanMIS LiasonCommented:
I don't know anything about your business rules, ...so I would ask why the nTagno number must be sequential. (hence you need to see which are "Missing".)

So could you clearly define what "missing" means and why it is a problem?

For example, If I have Products, the primary key is an autonumber.
I might have Product 125 products, but due to mistakes in data entry, I may actually only have 115 actual Products.
Since these "missing" products never actually existed (the data entry was aborted) they are not really missing, ...thus, a report to list them, might be meaningless...

Here, I am am not talking about "Discontinued" or "Inactive" products.

A discontinued product will be designated by an "Inactive" yes/no field in the main table.
So I can list all Inactive Products by a simple query like this:
SELECT ProductID, ProductName, ProductPrice, ProductActiive
FROM tblProducts
WHERE ProductActive=False

JeffCoachman
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