使用SQL语句处理及查询电商业务数据(上)

数据概览

goods_color

goods_size

order_detail

绘制E-R关系图

建表导数

create table goods_color(
	color_id varchar(6) not null default '-',
    color_note varchar(20) not null default '-'
);

load data local infile 'D:/goods_color.txt'
	into table goods_color
    fields terminated by '\t'
    ignore 1 lines;

select * from goods_color;

create table goods_size(
	size_id varchar(4) not null default '-',
    size_note varchar(100) not null default '-'
);

load data local infile 'D:/goods_size.txt'
	into table goods_size
    fields terminated by '\t'
    ignore 1 lines;
    
select * from goods_size;

create table order_detail(
	order_id varchar(6) not null default '-',
    goods_id varchar(6) not null default '-',
    goods_price double not null default 0,
    color_id varchar(4) not null default '-',
    size_id varchar(4) not null default '-',
    amount int not null default 0
);

load data local infile 'D:/order_detail.txt'
	into table order_detail
    fields terminated by '\t'
    ignore 1 lines;

select * from order_detail;

业务查询

-- 倒序查询卖的金额最多的产品
select goods_id,sum(goods_price*amount) total_price
from order_detail
group by goods_id
order by total_price desc;

-- 查询不同尺码下的产品销售数量 
select size_note,goods_id,sum(amount) gross
from order_detail o left join goods_size g on o.size_id = g.size_id
group by size_note,goods_id;

-- 查询不同颜色下的产品销售金额 
select color_note,goods_id,sum(goods_price*amount) total_price
from order_detail o left join goods_color g on o.color_id = g.color_id
group by color_note,goods_id;

-- 查询不同尺码下的不同颜色的产品销售金额 
select size_note,color_note,goods_id,sum(goods_price*amount) total_price
from order_detail o left join goods_size gs on o.size_id = gs.size_id
					left join goods_color gc on o.color_id = gc.color_id
group by size_note,color_note,goods_id;