Mysql计算同比环比(超详细) |
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1、首先观察两个表的格式 表1、销售明细
表2、产品明细 2、在mysql中新建表 表1:订单明细表 sales sql如下 CREATE TABLE sales ( `产品ID` int NOT NULL, `销售数量` int(20) , `销售时间` timestamp(6) NULL DEFAULT NULL, PRIMARY KEY (`订单ID`) ) INSERT INTO sales VALUES ('C1001', 15, '2020-06-01 10:10:12'); INSERT INTO sales VALUES ('C1002',26, '2020-05-02 0:10:12'); INSERT INTO sales VALUES ('C1003', 21, '2020-04-03 0:10:12'); INSERT INTO sales VALUES ('C1003', 23, '2020-04-04 0:10:12'); INSERT INTO sales VALUES ('C1003', 0, '2020-03-05 0:10:12'); INSERT INTO sales VALUES ('C1001', 16, '2020-02-06 3:0:12'); INSERT INTO sales VALUES ('C1002', 32, '2020-01-07 0:10:12'); INSERT INTO sales VALUES ('C1001', 16, '2019-12-08 0:12:24'); INSERT INTO sales VALUES ('C1001', 32, '2019-06-09 0:12:24'); INSERT INTO sales VALUES ('C1002', 17, '2019-05-09 0:12:24');数据预览:
表2:产品表 product sql 如下: CREATE TABLE product ( `产品ID` varchar(20) NOT NULL, `产品名称` varchar(20) , `产品单价` int (10) ) INSERT INTO product VALUES ('C1001','产品A',45); INSERT INTO product VALUES ('C1002','产品B',52); INSERT INTO product VALUES ('C1003','产品C',39);预览 3、计算同比环比 sql如下: select year(c.销售时间) yy,month(c.销售时间) mm, sum(c.销售数量*d.产品单价) ss, concat(ifnull(abs(round((sum(c.销售数量*d.产品单价)-ss1)/ss1*100,2)),0),'%') 同比, concat(ifnull(abs(round((sum(c.销售数量*d.产品单价)-ss2)/ss2*100,2)),0),'%') 环比 from sales c left join product d on c.产品ID=d.产品ID left join (select month(a.销售时间) mm1, year(a.销售时间) yy1, sum(a.销售数量*d.产品单价) ss1 from sales a left join product d on a.产品ID=d.产品ID GROUP BY mm1,yy1) a on month(c.销售时间) = a.mm1 and a.yy1 = year(c.销售时间)-1 left join (select month(a.销售时间) mm2, year(a.销售时间) yy2, sum(a.销售数量*d.产品单价) ss2 from sales a left join product d on a.产品ID=d.产品ID GROUP BY mm2,yy2) b on (b.yy2 = year(c.销售时间) and b.mm2+1 = month(c.销售时间) OR (yy2=year(c.销售时间)-1 AND b.mm2 = 12 AND month(c.销售时间) = 1)) group by yy, mm order by yy,mm ascsql解析: select year(c.销售时间) yy,month(c.销售时间) mm, sum(c.销售数量*d.产品单价) ss, # concat函数,mysql字符串拼接,因为同比和环比都是百分数 # ifnull函数,mysql判断字段是否为空,为空则为0 # abs函数,mysql取绝对值,因为我这里取的都是正数 # round函数,mysql保留几位小数 concat(ifnull(abs(round((sum(c.销售数量*d.产品单价)-ss1)/ss1*100,2)),0),'%') 同比, concat(ifnull(abs(round((sum(c.销售数量*d.产品单价)-ss2)/ss2*100,2)),0),'%') 环比 from sales c left join product d on c.产品ID=d.产品ID # 上一年销售额 left join (select month(a.销售时间) mm1, year(a.销售时间) yy1, sum(a.销售数量*d.产品单价) ss1 from sales a left join product d on a.产品ID=d.产品ID GROUP BY mm1,yy1) a # 同比月份相同,年份减1 on month(c.销售时间) = a.mm1 and a.yy1 = year(c.销售时间)-1 # 今年销售额 left join (select month(a.销售时间) mm2, year(a.销售时间) yy2, sum(a.销售数量*d.产品单价) ss2 from sales a left join product d on a.产品ID=d.产品ID GROUP BY mm2,yy2) b # 环比取数考虑到为一月的情况 on (b.yy2 = year(c.销售时间) and b.mm2+1 = month(c.销售时间) OR (yy2=year(c.销售时间)-1 AND b.mm2 = 12 AND month(c.销售时间) = 1)) group by yy, mm order by yy,mm asc运行结果如下: 结果测试: 温馨提示: 由于mysql在规则上和函数上与Oracle等也有些差异,列如:函数、大小写、别名的情况都可能导致出现sql执行的结果出现问题,所以在套用的时候需要细心一点。 除此之外,还要计算累计销售 sql如下: select year(销售时间) yy,month(销售时间) mm, sum(销售数量*b.产品单价) over(order by year(销售时间) ,month(销售时间) ) 累计数量 from sales a left join product b on a.产品ID=b.产品ID order by yy,mm查看了一些资料,感觉环比同比还是不太好写,今天总结整理一下。
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