I have a summary table with total purchase by customer, item ,quarter:
customer, item, qtr1_total,qtr2_total,qtr3_total,qtr4_total
Using Postgres 9.2, how would I get:
1) Percent of total of customer by item by qtr.
i.e. Shirts is 32% of customer ABC purchases for qtr1, 28% of customer ABC purchases qtr 2, etc...
2) Percent of total of item by customer by qtr.
i.e. Customer ABC shirt purchases was 2% of total shirt purchases for qtr1, 4% of total shirt purchases for qtr2 ,etc..
Ideally, would like to get both in same query but if not feasible, then 2 different queries can be used.