Question

I have a int column in my table in a SQL database.
I keep some of codes in this table.
For sample range of my codes is : (1, 9).
I need to not used code in this range.

Example:
Used Codes is :

Select code from MyTable  -- result is 2,6,7,8,9

Not used codes is : 1,3,4,5

Now , how can I select this codes? Expected result is : 1,3,4,5

Answer 1

Generate a list of numbers for your range (here I use VALUES clause), then semi-join to the “used” list

SELECT
    *
FROM
   (VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9)) X (Num)
WHERE
   NOT EXISTS (SELECT * FROM MyTable M WHERE M.Code = X.Num)

Edit:

You can replace the VALUES clause with any number table generation code.
Examples:

• Optimizing Numbers Table Creation on SQL Server?
• What is the best way to create and populate a numbers table?