MySQL实践之同比环比

SET global sql_mode='';
SET session sql_mode='';

SET @startDay = '2016-01-01';
SET @endDay = '2017-04-01';
SELECT
tbl.YearMonth,		-- 年月
tbl.t1 AS Amount,		-- 当期金额

CASE WHEN t2 = 0 OR t2 IS NULL
THEN 0.00
ELSE ((t1-t2) / t2) * 100 END AS ProportionH,		-- 环比

CASE WHEN t3 = 0 OR t3 IS NULL
THEN 0.00
ELSE ((t1-t3) / t3) * 100 END AS ProportionT		-- 同比

FROM
(
SELECT
DATE_FORMAT(b1.BIDate,'%Y-%m') AS YearMonth,
SUM(a1.SaleAmt) AS t1,		-- 当期金额
(
SELECT
CASE WHEN a2.SaleAmt = 0 OR a2.SaleAmt IS NULL
THEN 0.00
ELSE SUM(a2.SaleAmt) END
FROM fact_sumday AS a2 INNER JOIN dim_bidate AS b2 ON a2.BIDateId = b2.BIDateId
WHERE DATE_FORMAT(b1.BIDate,'%Y-%m') = DATE_FORMAT(DATE_ADD(b2.BIDate,INTERVAL 1 MONTH),'%Y-%m')		-- 表的自连接实现
) AS t2,		-- 环期金额
(
SELECT
CASE WHEN a3.SaleAmt = 0 OR a3.SaleAmt IS NULL
THEN 0.00
ELSE SUM(a3.SaleAmt)  END
FROM fact_sumday AS a3 INNER JOIN dim_bidate AS b3 ON a3.BIDateId = b3.BIDateId
WHERE DATE_FORMAT(b1.BIDate,'%Y-%m') = DATE_FORMAT(DATE_ADD(b3.BIDate,INTERVAL 1 YEAR),'%Y-%m')		-- 表的自连接实现
) AS t3		-- 同期金额
FROM fact_sumday AS a1 INNER JOIN dim_bidate AS b1 ON a1.BIDateId = b1.BIDateId
GROUP BY 1
) AS tbl
WHERE tbl.YearMonth BETWEEN DATE_FORMAT(@startDay,'%Y-%m') AND DATE_FORMAT(@endDay,'%Y-%m');