Question

您好，我的 MYSQL 数据库包含名为new-sell的表格，其中包含以下列registeredDay和productFinalPrice强>总 已注册购买值，日期该条目已。

|=====================================| | productFinalPrice | registeredDay | |=====================================| | 600,00 | 2017-09-19 18:45:16 | | 435,50 | 2017-09-18 18:45:16 | | 817,60 | 2017-09-17 18:45:16 | | 176,00 | 2017-09-16 18:45:16 | | 600,00 | 2017-09-15 18:45:16 | | 600,00 | 2017-09-14 18:45:16 | | 600,00 | 2017-09-13 18:45:16 | | 842,10 | 2017-09-20 18:45:16 | | 415,20 | 2017-09-21 18:45:16 | | 230,45 | 2017-09-22 18:45:16 | | 400,00 | 2017-09-20 18:45:16 | | 375,00 | 2017-09-20 18:45:16 | =======================================

我使用这个 MySQL命令计算平均收入与昨天以及之前相比的昨天

SELECT PRICE_T / (PRICE_T2-PRICE_T) * 100 AS PERC
FROM (SELECT SUM(CASE WHEN RN=1 THEN PRICE_I2 ELSE 0 END) AS PRICE_T
           , SUM(PRICE_I2) AS PRICE_T2
      FROM (SELECT CAST(registeredDay AS DATE) AS DDATE
            , SUM(productFinalPrice) AS PRICE_I2
            , @RN:=@RN+1 AS RN
            FROM new_sell 
            CROSS JOIN (SELECT @RN:=0) X
            WHERE registeredDay BETWEEN DATE_ADD(CURDATE(), INTERVAL -2 day) AND CURDATE()
            GROUP BY CAST(registeredDay AS DATE)
            ORDER BY CAST(registeredDay AS DATE)
           ) B
    ) C;

这是最终结果。 37,1057513914657

然而我希望围绕这个最终值到ROUND() 我将命令 添加到以上查询？

感谢您帮助我：]

Answer 1

您可以直接在您的选择中使用MySQL round()功能。

SELECT 
  ROUND(PRICE_T / (PRICE_T2-PRICE_T) * 100) AS PERC
FROM (SELECT SUM(CASE WHEN RN=1 THEN PRICE_I2 ELSE 0 END) AS PRICE_T
           , SUM(PRICE_I2) AS PRICE_T2
      FROM (SELECT CAST(registeredDay AS DATE) AS DDATE
            , SUM(productFinalPrice) AS PRICE_I2
            , @RN:=@RN+1 AS RN
            FROM new_sell 
            CROSS JOIN (SELECT @RN:=0) X
            WHERE registeredDay BETWEEN DATE_ADD(CURDATE(), INTERVAL -2 day) AND CURDATE()
            GROUP BY CAST(registeredDay AS DATE)
            ORDER BY CAST(registeredDay AS DATE)
           ) B
    ) C;

Answer 2

使用可以使用圆内的和 - SELECT ROUND（column_name，decimals）FROM table_name;

如何舍入最终结果查询

2 个答案: