Question

希望从常规数据输入中插入当月不存在的平均值。当前年份值不应插入到reg_data3表中的表avg_month_val1。

INSERT INTO 
    `clima_data`.`avg_month_val1` ( 
        `year` , 
        `month` , 
        `evep` , 
        `sunshine_hrs` , 
        `rainfall` , 
        `max_temp` , 
        `min_temp` ) 
    SELECT 
        year(str_to_date(date, '%m/%d/%Y'))as year,
        month(str_to_date(date, '%m/%d/%Y'))as month,
        round(avg(evep)),
        round(Avg(sunshine_hrs)),
        round(sum(rainfall)),
        round(AVG(max_temp)),
        round(avg(min_temp)) 
    FROM 
        reg_data 
    GROUP BY 
        year(str_to_date(date, '%m/%d/%Y')),
        month(str_to_date(date, '%m/%d/%Y'));

Answer 1

您应该写一个WHERE条件来排除当前年份。如果您只想要过去几年的数据，则可以将!=运算符更改为<。

另一点：date是mysql的DATE()函数的保留字。所以你应该为date和

做“奇怪的引用”

`date`

您可能的解决方案如下：

INSERT INTO 
    `clima_data`.`avg_month_val1` ( 
        `year` , 
        `month` , 
        `evep` , 
        `sunshine_hrs` , 
        `rainfall` , 
        `max_temp` , 
        `min_temp` ) 
    SELECT 
        YEAR(STR_TO_DATE(`date`, '%m/%d/%Y'))as year,
        YEAR(STR_TO_DATE(`date`, '%m/%d/%Y'))as month,
        ROUND(AVG(evep)),
        ROUND(AVG(sunshine_hrs)),
        ROUND(SUM(rainfall)),
        ROUND(AVG(max_temp)),
        ROUND(AVG(min_temp)) 
    FROM 
        reg_data 
    WHERE 
        YEAR(STR_TO_DATE(date, '%m/%d/%Y')) !=  YEAR(CURDATE())
    GROUP BY 
        YEAR(STR_TO_DATE(`date`, '%m/%d/%Y')),
        MONTH(STR_TO_DATE(`date`, '%m/%d/%Y'));

想要从常规数据输入中插入当月的平均值

1 个答案: