Hi both,

Many thanks for your responses.  A few apologies, I never thought of the concern about an embedded file so will provide a script in future.  The data we have...

Hi Jeff and SSC,

Many thanks for the pointers.  I had a look at NTILE which would seem to be what I would need if I was only using...

Can somebody point me in the right direction please ?

Hi Sean, thanks for your help. 
I probably wasn't clear enough in my explanation.  I am not trying to update the PACKING_TRACKER table.  I am trying to work out...