mysql - mysql中是否有代表一年中最后一天的函数

Question

我想将 reg_data3 表的 rainfall 列的所有值总和添加到 average_mas_curve 表列年份和所有值在前几年的过去数据中作为总和，但我想表示为一年中最后一天的函数，请给我......帮助我。 例如 y-12-31。

INSERT INTO mas_aver_curve (year, cumulative) 
    SELECT '2013-12-31', ROUND(SUM(rainfall), 1) rainfall 
    FROM reg_data3 G 
    WHERE date >= '2008-01-01' AND date <  '2013-12-31'

Answer 1

你可以试试:

INSERT INTO mas_aver_curve (year, cumulative) 
    SELECT STR_TO_DATE(CONCAT(year(NOW())-1,'-12-31'),'%Y-%m-%d') AS LastDay, 
           ROUND(SUM(rainfall), 1) rainfall 
    FROM reg_data3 G 
    WHERE date >= '2008-01-01' AND date <  '2013-12-31'
    GROUP BY 1;

sqlfiddle demo for the str_to_date part