Hi Raymond, Thanks for your reply. Please see detail as following. Thanks again.
Pierre [image: Inline image 1] On Thu, Jan 22, 2015 at 1:48 AM, Raymond O'Donnell <r...@iol.ie> wrote: > On 21/01/2015 17:32, Pierre Hsieh wrote: > > Hi guys, > > > > Thanks for your replies. > > > > I certainly can use VBA and ADODB object in Excel to do it. Due to > > performance, I wanna try to do it by SQL command in PG. However, I am > > not expert in PG, so I need few help from your guys. Let me to describe > > my question clearly as following. > > > > The final results which I wanna get > > are STDDEV(a1,a2,a3,...), STDDEV(b1,b2,b3,...), ..etc. I definitely know > > how to use standard deviation function in PG, but the critical problem > > for me is how to calculate a1, a2, a3, b1, b2, b3...etc. The rule to > > calculate them is a little complicated because it needs not only moving > > window function but also few logical rules. Please see details as > > following or attachment. I put some colors in rules. Hopefully, it's > > easier for you guys to read them. Thanks > > Sorry, either I'm being stupid or your description isn't clear. Can you > show your table structure, ideally with some sample data, and what you > hope to get from the query? > > Ray. > > > -- > Raymond O'Donnell :: Galway :: Ireland > r...@iol.ie >
SQL.xls
Description: MS-Excel spreadsheet
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