psql rank row

rank() OVER (PARTITION BY f1 ORDER BY f2 DESC) 

ROW_NUMBER() () OVER (PARTITION BY f1 ORDER BY f2 DESC) 
为每个匹配的f1字段生成一个行号，并按照f2排序

例子
select DID,customerID,totalPrice,ROW_NUMBER() over(order by totalPrice) as rows from OP_Order

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" alt="" />

可以用户讲多列的数据排序后横向比较，例如，oe的一个询价单，向多个供应商询价后，需要取前3个供应商价格横列显示。

select
        product_id,
        product_qty,
        max(part1) as parter1,
        max(price1) as price1,
        max(part2) as parter2,
        max(price2) as price2,
        max(part3) as parter3,
        max(price3) as price3
from(
        select
                product_id, product_qty,
                case  when  abc=1 then partner_id end as part1,
                case  when  abc=2 then partner_id end as part2,
                case  when  abc=3 then partner_id end as part3,
                case  when  abc=1 then price_unit end as price1,
                case  when  abc=2 then price_unit end as price2,
                case  when  abc=3 then price_unit end as price3
        from (
                select
                        pol.id, pol.product_id, pol.partner_id, product_qty , pol.price_unit,
                        rank() OVER (PARTITION BY pol.product_id order by pol.partner_id) as abc
                        from
                                purchase_requisition as rq
                                left join purchase_order as po on  (po.requisition_id = rq.id)
                                left join purchase_order_line as pol on (pol.order_id = po.id)
                        where rq.id = 44
              ) as t
    ) as tt group by product_id,product_qty

结果如下：