Sytze,
Tracy's recommendation says, simply, index on Invoice number + Date.  Thus, 
each Invoice is in order and within it the lines are ordered by date, which is 
what you said you wanted.
But Stephen Russel has a good point.  Apparently your data has line numbers for 
the invoices, so why worry about the date?  Simply index on Invoice number + 
Line number.
Dan Covill

> > On September 17, 2014 9:40:47 PM EDT, Sytze de Boer <[email protected]>
> > wrote:
> > >
> > >1  I need to have all the entries for the client ordered by invoice
> > >number
> > >2  but also in date order
> > >
> > >(Date are set british)
> > >Example
> > >Date               Invnum   Qty    Amount     Desc
> > >21/7/2014      1000        1       1000.00    1st line on invoice
> > >21/7/2014      1000        1        45.00        2nd line on the
> > >invoice
> > >(There may be 20 lines)
> > >
> > >14/7/2014      1001        1         5000       Invoice line 1
> > >14/7/2014      1001        2             34       Line 2

> On Thu, Sep 18, 2014 at 1:44 PM, Tracy Pearson <[email protected]>
> wrote:
>>> > The quick answer is to index on padl(invoice)+dtos(date)
> > --
> > Sent from my Android device with K-9 Mail. Please excuse my brevity.
> >
[excessive quoting removed by server]

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