32. 某周内每件商品每天销售情况

题目需求

从订单明细表（order_detail）中查询2021年9月27号-2021年10月3号这一周所有商品每天销售情况。

期望结果如下（截取部分）：

sku_id	monday	tuesday	wednesday	thursday	friday	saturday	sunday
1	0	0	9	8	0	4	2
10	0	0	0	0	48	69	0
11	0	0	0	0	15	61	0
12	0	0	43	0	31	20400	0
2	0	0	0	18	5800	0	0

需要用到的表：

订单明细表：order_detail

order_detail_id(订单明细id)	order_id(订单id)	sku_id(商品id)	create_date(下单日期)	price(商品单价)	sku_num(商品件数)
1	1	1	2021-09-30	2000.00	2
2	1	3	2021-09-30	5000.00	5
22	10	4	2020-10-02	6000.00	1
23	10	5	2020-10-02	500.00	24

实现一

select sku_id,
       sum(if(create_date = '2021-09-27', sku_num, 0)) as monday,
       sum(if(create_date = '2021-09-28', sku_num, 0)) as tuesday,
       sum(if(create_date = '2021-09-29', sku_num, 0)) as wednesday,
       sum(if(create_date = '2021-09-30', sku_num, 0)) as thursday,
       sum(if(create_date = '2021-10-01', sku_num, 0)) as friday,
       sum(if(create_date = '2021-10-02', sku_num, 0)) as saturday,
       sum(if(create_date = '2021-10-03', sku_num, 0)) as sunday
from order_detail
where '2021-09-27' <= order_detail.create_date
  and order_detail.create_date <= '2021-10-03'
group by sku_id;

题目来源

http://practice.atguigu.cn/#/question/32/desc?qType=SQL