Bill wrote: here lies the output of oclh (i.e "\d oclh")

Table "public.oclh"
Column | Type | Modifiers --------+-----------------------+-------------------------------
symbol | character varying(10) | not null default ''
date | date | not null default '0001-01-01'
open | numeric(12,2) | not null default '0.00'
close | numeric(12,2) | not null default '0.00'
low | numeric(12,2) | not null default '0.00'
high | numeric(12,2) | not null default '0.00'
Indexes: symbol_2_oclh_index btree (symbol, date),
symbol_oclh_index btree (symbol, date)

Well, I'm not sure why the two indexes on the same columns, and I'm not sure it makes sense to have defaults for _any_ of the columns there.

So - you want:
1. ratio = abs(closing-opening)/opening
2. average = all the ratios of each day of each stock
3. Highest average

Well, I don't know what you mean by #2, but #1 is just:

  abs(close - open)/open AS ratio
  symbol, date;

I'd probably fill in a summary table with this and use that as the basis for your further queries. Presumably from "yesterday" back, the ratios/averages won't change.

  Richard Huxton
  Archonet Ltd

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