Question

我想从 reg_data3 中选择常规数据并获取平均月份值并插入平均值表作为更新，但效果不佳。

SELECT   
     year(str_to_date(date, '%Y-%m-%d'))as year, 
     month(str_to_date(date, '%Y-%m-%d')) as month, 
     round(avg(evep),2), 
     round(Avg(sunshine_hrs),2), 
     round(sum(rainfall),2), 
     round(AVG(max_temp),2), 
     round(avg(min_temp),2) 
FROM 
    reg_data3 
GROUP BY 
    year(str_to_date(date, '%Y-%m-%d')), 
    month(str_to_date(date, '%Y-%m-%d')) 
ORDER BY 1 Desc 

UPDATE 
    avg_month_val 
set 
    year='year' , 
    month='month',  
    evep='evep' , 
    sunshine_hrs='sun_shine_hrs', 
    rainfall='rainfall', 
    max_temp='max_temp', 
    min_temp='min_temp';

Answer 1

试试这个：

UPDATE 
    avg_month_val 

set 
    `year`          =   YEAR(STR_TO_DATE(`date`, '%Y-%m-%d')), 
    `month`         =   MONTH(STR_TO_DATE(`date`, '%Y-%m-%d')), 
    `evep`          =   ROUND(AVG(`evep`), 2), 
    `sunshine_hrs`  =   ROUND(AVG(`sunshine_hrs`) ,2), 
    `rainfall`      =   ROUND(SUM(`rainfall`), 2), 
    `max_temp`      =   ROUND(AVG(`max_temp`), 2), 
    `min_temp`      =   ROUND(AVG(`min_temp`), 2) 

FROM 
    reg_data3 

GROUP BY 
    MONTH(STR_TO_DATE(`date`, '%Y-%m-%d')), 
    MONTH(STR_TO_DATE(`date`, '%Y-%m-%d'))

选择常规数据并插入平均月值作为更新但错误

1 个答案: