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How to find the difference for a numeric field with 2 records?

How to find the difference for a numeric field with 2 records?

How to find the difference for a numeric field with 2 records?

(OP)
Is there a way in SQL to find the difference for a numeric field between the current record and the previous record? For example, a table has a field called InvoiceNbr.  The currect record has InvoiceNbr = 1500.  The previous record has the same InvoiceNbr field = 1000 so the difference would be 500. I would like to run a query that shows the previous InvoiceNbr, current InvoiceNbr, and the differnce between the two if the difference between the two records is greater than one.  Thanks.

RE: How to find the difference for a numeric field with 2 records?

CODE

SELECT this.InvoiceNbr AS this_number
     , prev.InvoiceNbr AS prev_number
  FROM daTable AS this
LEFT OUTER
  JOIN daTable AS prev
    ON prev.InvoiceNbr =
       ( SELECT MAX(InvoiceNbr)
           FROM daTable
          WHERE InvoiceNbr < this.InvoiceNbr )
 WHERE this.InvoiceNbr - prev.InvoiceNbr > 1

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