多表查詢練習：電商數(shù)據(jù)查詢練習

依據(jù)商品顏色表和商品尺寸表，完成以下練習：

倒序查詢賣的金額最多的產(chǎn)品

查詢不同尺碼下的產(chǎn)品銷售數(shù)量

查詢不同顏色下的產(chǎn)品銷售金額

查詢不同尺碼下的不同顏色的產(chǎn)品銷售金額

-- ----GoodsColor---- create table goodscolor ( ColorID varchar(4) not null default '-', ColorNote varchar(20) not null default '-', ColorSort int not null default 0, pt varchar(9) not null default '-' ); #導入數(shù)據(jù) load data local infile '/Users/zhucan/Desktop/GoodsColor.txt' into table goodscolor fields terminated by ',' ignore 1 lines; -- ----GoodsSize---- create table goodssize ( SizeID varchar(4) not null default '-', SizeNote varchar(100) not null default '-', SizeSort int not null default 0, pt varchar(9) not null default '-' ); #導入數(shù)據(jù) load data local infile '/Users/zhucan/Desktop/GoodsSize.txt ' into table goodssize fields terminated by ',' ignore 1 lines; -- ----OrderDetail---- create table OrderDetail ( OrderID varchar(6) not null default '-', GoodsID varchar(6) not null default '-', GoodsPrice double not null default 0, ColorID varchar(4) not null default '-', SizeID varchar(4) not null default '-', Amount int not null default 0 ); #導入數(shù)據(jù) load data local infile '/Users/zhucan/Desktop/OrderDetail.txt' into table OrderDetail fields terminated by '\t' ignore 1 lines; select * from orderdetail; select * from goodscolor; select * from goodssize; -- 1.倒序查詢賣的金額最多的產(chǎn)品 select GoodsID, sum(GoodsPrice*amount) from orderdetail group by goodsid order by sum(GoodsPrice*amount) desc; -- 2.查詢不同尺碼下的產(chǎn)品銷售數(shù)量 select SizeNote, sum(amount) from orderdetail #一般令數(shù)據(jù)多的為主表，主表在左邊 left join goodssize on orderdetail.sizeid = goodssize.sizeid group by orderdetail.sizeid order by sum(amount) desc; -- 3. 查詢不同顏色下的產(chǎn)品銷售金額 select colornote as 顏色, sum(goodsprice * amount) as 銷售額 from orderdetail as od left join goodscolor as gc on od.colorid=gc.colorid group by od.colorid order by sum(goodsprice * amount) desc; -- 4. 查詢不同尺碼下的不同顏色的產(chǎn)品銷售金額 -- 4. 查詢不同尺碼下的不同顏色的產(chǎn)品銷售金額 select sizenote,colornote,sum(goodsprice * amount) from orderdetail as od left join goodssize as gs on od.sizeid = gs.sizeid left join goodscolor as gc on od.colorid = gc.colorid group by od.sizeid, od.colorid order by sum(goodsprice * amount) desc;

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