sql query - last invoice date where invoice is greater than zero

How can I make this query return not just the max invoice date, but latest invoice date where the invoice is greater than zero?  Ignore zero dollar invoices.  The field is Docamnt for invoice amount.

SELECT DISTINCT t1.CUSTNMBR, t2.max_GLPOSTDT
FROM            dbo.SOP30200 AS t1 INNER JOIN
                             (SELECT        CUSTNMBR, MAX(GLPOSTDT) AS max_GLPOSTDT
                               FROM            dbo.SOP30200
                               GROUP BY CUSTNMBR) AS t2 ON t1.CUSTNMBR = t2.CUSTNMBR


So I want to find the last invoice date for each customer where the invoice is greater than zero.
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mike247Asked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
you could use the syntax explained in my article here:
http://www.experts-exchange.com/articles/3203/DISTINCT-and-GROUP-BY-and-why-does-it-not-work-for-my-query.html

in your "basic" sql, you could limit to:
SELECT DISTINCT t1.CUSTNMBR, t2.max_GLPOSTDT
FROM            dbo.SOP30200 AS t1 INNER JOIN
                             (SELECT        CUSTNMBR, MAX(GLPOSTDT) AS max_GLPOSTDT
                               FROM            dbo.SOP30200
                              WHERE Docamnt > 0
                               GROUP BY CUSTNMBR) AS t2 ON t1.CUSTNMBR = t2.CUSTNMBR

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but I recommend to read the above article, the techniques using the row_number() over (partition by) shall normally give better (faster) results
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mike247Author Commented:
works great.  Thanks.
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