电商交易项目案例

电商交易项目案例
--字段含义--
Sdate定义了日期的分类，将天天分别赋予所属的月份、星期、季度等属性，
字段分别为日期、年月、年、月、日、周几、第几周、季度、旬、半月；
Stock定义了订单表头，字段分别为订单号、交易位置、交易日期；
StockDetail文件定义了订单明细，该表和Stock以交易号进行关联，
字段分别为订单号、行号、货品、数量、价格、金额；

--建立sdate表--
CREATE TABLE sdate(
dateID string, --日期
theyearmonth string,--年月
theyear string,--年
themonth string,--月
thedate string,--日
theweek string,--周几
theweeks string,--第几周
thequot string,--季度
thetenday string,--旬
thehalfmonth string --半月
)
ROW FORMAT DELIMITED FIELDS TERMINATED BY ','
LINES TERMINATED BY '\n' ;

--建立stock表--
CREATE TABLE stock(
ordernumber string,--订单号
locationid string,--交易位置
dateID string --日期
)
ROW FORMAT DELIMITED FIELDS TERMINATED BY ','
LINES TERMINATED BY '\n' ;

--建立stockdetail表--
CREATE TABLE stockdetail(
ordernumber string,--订单号
rownum int,--行号
itemid string, --货品
qty int, --数量
price int, --价格
amount int --总金额
) ROW FORMAT DELIMITED FIELDS TERMINATED BY ','
LINES TERMINATED BY '\n' ;

建立表，导入数据
load data local inpath '/home/lan/sdate.txt'
overwrite into table sdate;

load data local inpath '/home/lan/stock.txt'
overwrite into table stock;

load data local inpath '/home/lan/stockdetail.txt'
overwrite into table stockdetail;

一、计算全部订单每一年的总金额
算法分析：
要计算全部订单每一年的总金额，首先须要获取全部订单的订单号、订单日期和订单金信息，
而后把这些信息和日期表进行关联，
获取年份信息，最后根据这四个列按年份归组统计获取全部订单每一年的总金额。
select a.theyear,sum(c.amount) from sdate a,stock b,stockdetail c where a.dateID=b.dateID and b.ordernumber=c.ordernumber group by a.theyear;

二、计算全部订单每一年最大金额订单的销售额
算法分析：

该算法分为两步：
1）按照日期和订单号进行分组计算，
获取全部订单天天的销售数据；

select a.dateid, a.ordernumber,sum(b.amount) as sumofamount
from stock a,stockdetail b
where a.ordernumber=b.ordernumber
group by a.dateid,a.ordernumber;

2）把第一步获取的数据和日期表进行关联获取的年份信息，
而后按照年份进行分组，使用Max函数，获取全部订单每一年最大金额订单的销售额。

select c.theyear,max(d.sumofamount) from sdate c,
(select a.dateid, a.ordernumber,sum(b.amount) as sumofamount
from stock a,stockdetail b
where a.ordernumber=b.ordernumber
group by a.dateid,a.ordernumber)d
where c.dateid=d.dateid
group by c.theyear order by c.theyear;

三、统计全部订单中季度销售额前10位
select c.theyear,c.thequot,sum(b.amount) as sumofamount
from stock a,stockdetail b,sdate c
where a.ordernumber=b.ordernumber and a.dateid=c.dateid
group by c.theyear,c.thequot
order by sumofamount desc limit 10;

四、列出销售金额在100000以上的单据(订单号)
select a.ordernumber,sum(b.amount) as sumofamount
from stock a,stockdetail b
where a.ordernumber=b.ordernumber
group by a.ordernumber
having sumofamount>100000;
五、全部订单中每一年最畅销货品
第一步：
统计出每一年每种货品的销售总金额
stock a,stockdetail b,sdate c
===================================
select c.theyear,b.itemid,sum(b.amount) as sumofamount
from stock a,stockdetail b,sdate c
where a.ordernumber=b.ordernumber and a.dateid=c.dateid
group by c.theyear,b.itemid;

第二步: 在第一步的数据上，统计出每一年最大的销售总金额 将第一步的数据集起别名为d; select d.theyear,max(sumofamount) as maxofamount from (select c.theyear,b.itemid,sum(b.amount) as sumofamount from stock a,stockdetail b,sdate c where a.ordernumber=b.ordernumber and a.dateid=c.dateid group by c.theyear,b.itemid) d group by d.theyear; 第三步：全部订单中每一年最畅销货品 e:每一年每种货品的销售总金额 f:每一年最大的销售总金额 select distinct e.theyear,e.itemid,f.maxofamount from (select c.theyear,b.itemid, sum(b.amount) as sumofamount from stock a,stockdetail b,sdate c where a.ordernumber=b.ordernumber and a.dateid=c.dateid group by c.theyear,b.itemid) e, (select d.theyear,max(d.sumofamount) as maxofamount from (select c.theyear,b.itemid,sum(b.amount) as sumofamount from stock a,stockdetail b,sdate c where a.ordernumber=b.ordernumber and a.dateid=c.dateid group by c.theyear,b.itemid) d group by d.theyear) f where e.theyear=f.theyear and e.sumofamount=f.maxofamount order by e.theyear;