大體思路：

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MySQL沒有類似oracle方便的統計函數，只能靠自己去硬計算：通過時間字段直接增加年份、月份，然后通過left join關聯時間字段去計算環比、同比公式即可

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原始表結構：

求同比SQL：

-- 按年同比SELECT t5.*, CASE WHEN t5.last_energy_year IS NULL OR t5.last_energy_year =0 THEN 0.00ELSE FORMAT(((t5.energy_year - t5.last_energy_year)/t5.last_energy_year)*100,2) END YoY??-- 同比 FROM ( SELECT t3.*,t4.last_energy_yearFROM (SELECT DATE_FORMAT(CONCAT(t1.`tyear`, '-', t1.`tmonth`,'-01'),'%Y-%m-%d') AS YearMonth,t1.tyear,SUM(t1.energy_month) energy_year,t1.linenameFROM(SELECT t.*,COUNT(DISTINCT t.`tyear`,t.`tmonth`,t.`linename`) c_cot FROM `ksh_tgyjy_llxgyjydlxx` t GROUP BY t.`linename`,t.`tyear`,t.`tmonth`,t.`linename`) t1GROUP BY t1.tyear,t1.`linename`) t3 LEFT JOIN (SELECT DATE_ADD(DATE_FORMAT(CONCAT(t1.`tyear`, '-', t1.`tmonth`,'-01'),'%Y-%m-%d'),INTERVAL 1 YEAR) AS lastYearMonth,t1.tyear,SUM(t1.energy_month) last_energy_year,t1.linenameFROM(SELECT t.*,COUNT(DISTINCT t.`tyear`,t.`tmonth`,t.`linename`) c_cot FROM `ksh_tgyjy_llxgyjydlxx` t GROUP BY t.`linename`,t.`tyear`,t.`tmonth`,t.`linename`) t1GROUP BY t1.tyear,t1.`linename`) t4ON t3.YearMonth = t4.lastYearMonthAND t3.linename = t4.linename ) t5

查詢結果：

求月環比SQL：

-- 按月同比SELECT DATE_FORMAT(t5.YearMonth,'%Y-%m') YearMonth,t5.`linename`,t5.`energy_month`, CASE WHEN t5.lat_energy_month IS NULL OR t5.lat_energy_month=0 THEN 0.00ELSE FORMAT(((t5.energy_month - t5.lat_energy_month)/t5.lat_energy_month)*100,2) END YoY FROM ( SELECT t3.*,t4.energy_month lat_energy_monthFROM (SELECT DATE_FORMAT(CONCAT(t1.`tyear`, '-', t1.`tmonth`,'-01'),'%Y-%m-%d') AS YearMonth,t1.*FROM(SELECT t.*,COUNT(DISTINCT t.`tyear`,t.`tmonth`,t.`linename`) c_cot FROM `ksh_tgyjy_llxgyjydlxx` t GROUP BY t.`linename`,t.`tyear`,t.`tmonth`,t.`linename`) t1) t3 LEFT JOIN (SELECT DATE_ADD(DATE_FORMAT(CONCAT(t1.`tyear`, '-', t1.`tmonth`,'-01'),'%Y-%m-%d'),INTERVAL 1 YEAR) AS lastYearMonth,t1.* FROM(SELECT t.*,COUNT(DISTINCT t.`tyear`,t.`tmonth`,t.`linename`) c_cot FROM `ksh_tgyjy_llxgyjydlxx` t GROUP BY t.`linename`,t.`tyear`,t.`tmonth`,t.`linename`) t1) t4ON t3.YearMonth = t4.lastYearMonthAND t3.linename = t4.linename ) t5

查詢結果：

總結

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