1 明确数据分析目标

统计所有订单中的每种分类对应的商品的个数，构建词云图

2 创建用于保存数据分析结果的表

create table app_cat_cnt(
  id int primary key auto_increment,
  daystr varchar(20),
  catName varchar(100),
  cnt int
);

3 编写SQL语句进行数据分析

select
	substring(a.createTime,1,10) as daystr,
	c.catName,
	count(*) as cnt
from	ods_finebi_order_goods a 
join ods_finebi_goods b on a.goodsId = b.goodsId 
join ods_finebi_good_cats c on b.goodsCatId = c.catId
group by c.catName, substring(a.createTime,1,10)
order by cnt desc;

4 加载到结果表中

insert into app_cat_cnt
select
	null,
	substring(a.createTime,1,10) as daystr,
	c.catName,
	count(*) as cnt
from ods_finebi_order_goods a 
join ods_finebi_goods b on a.goodsId = b.goodsId 
join ods_finebi_good_cats c on b.goodsCatId = c.catId
group by c.catName, substring(a.createTime,1,10)
order by cnt desc;