Question

How do I reduce the length of nested formulas by using references for previous formulas?

For example I would like to do the following but get an error:

(orders.size_0 + orders.size_1 + orders.size_2 + orders.size_3 + orders.size_4 +     orders.size_5 + orders.size_6) AS tot_qty,
ROUND(tot_qty*orders.order_price,0) AS tot_price,
ROUND(tot_price/f.rate,0) AS price_gbp

Thanks,
Derek.

Answer 1

You may use a subqueries, for example –

SELECT tot_qty, tot_price, ROUND(tot_price / sub1.rate,0) AS price_gbp FROM (
  SELECT tot_qty, ROUND(tot_qty * sub2.order_price, 0) AS tot_price FROM (
    SELECT (orders.size_0 + orders.size_1 + orders.size_2 + orders.size_3 + orders.size_4 + orders.size_5 + orders.size_6) AS tot_qty FROM table
      ...
    ) sub2
  ) sub1