SQL 综合练习详解专题6：商品 ABC 分析 0页

选择一个月，选择一家门店：
对商品进行按月汇总并按销售额进行排名，ABC 分类规则：A 类商品占门店前 60%的销售，
B 类商品占后 30%，C 类商品占后 10%。
1、计算出 ABC 各类商品 SKU 数，给每个商品 ABC 的标签。
# 要点说明，我们需要定义一个变量，用于记录商品的累计值
# 然后再对进行相关分类
select t1.ShopID
,GoodsID
,sales_value
,total_sales
,max_vlaue
,total_sales/max_vlaue
,case when total_sales/max_vlaue <=0.6 then 'A'
when total_sales/max_vlaue <=0.8 and
total_sales/max_vlaue>0.6 then 'B'
when total_sales/max_vlaue > 0.8 then 'C' end
as type_1
from (select ShopID
,a.GoodsID
,a.sales_value
,(@total_sales := @total_sales + a.sales_value) as
total_sales
from
( select t1.GoodsID
,t1.ShopID
,sum(t1.SaleValue) as sales_value
from demo.orderitem as t1
where t1.SDate between 20160101 and 20160131
and t1.ShopID = 'WDGC'
group by t1.GoodsID
,t1.ShopID
order by sum(t1.SaleValue) desc
) as a
join (select @total_sales := 0) as x
) t1
join (select t1.ShopID
,sum(t1.SaleValue) as max_vlaue
 from demo.orderitem as t1