SQL Query to show data not in table

I need your help. I have a query similar to the below with many more customer numbers. Records are showing but some of the customer numbers do not exists in the table, how can I modify the query below so it shows me the customers numbers that do not exist in the table.

Hope the above question makes sense.

select   *
from Customer
where customer_number in ('45212', '85255','25887','4284JK','488555HJK','47852ETH','58641TYR','45870')
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Vikas GargAssociate Principal EngineerCommented:

I am not getting your query.

What you will achieve by knowing the customer number which are not there  in the customer table.

But you can get a list of customer_number from table
Select distinct  customer_number from Customer

You can then insert these multiple values to temp table

and then
do except query

select customer_number from @temptable


Select distinct  customer_number from Customer

this will give you the customer_number which are in the select list and not in the customer table

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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
if your data does not exist in database, how you can select it? : )

to do a quick check, possibly you need to do some hardcoding scripts like:

Select a.* from
Select '45212' as customer_number
select '85255'
select '25887'
select '4284JK'
select '488555HJK'
select '47852ETH'
select '58641TYR'
select '45870'
) a
where a.customer_number not in
select customer_number from Customer

alternatively, do as what Vikas Garg had suggested, to insert those customer numbers into a temp table or so, and then you can compare the values accordingly.
jose11auAuthor Commented:
Thank you.
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Microsoft SQL Server

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