技術標籤：資料庫java

select detail_id,DATE_FORMAT(create_date,'%Y-%m-%d') date ,sum(diff_data) from report where detail_id in (3304) and DATE_FORMAT(create_date,'%Y-%m-%d') = '2020-12-18' group by detail_id order by date asc ;

select detail_id,DATE_FORMAT(create_date,'%Y-%m') date ,sum(diff_data) from report where detail_id in (
 
3304) and DATE_FORMAT(create_date,'%Y-%m') = '2020-12' group by detail_id order by date asc ;


select detail_id,CONCAT(YEAR(create_date),'_',quarter(create_date)) date ,sum(diff_data) from report 
where detail_id in (3304) and CONCAT(YEAR(create_date),'_',quarter(create_date)) = '2020_4' group by detail_id order by date asc ;
 


select detail_id,DATE_FORMAT(create_date,'%Y') date ,sum(diff_data) from report where detail_id in (3304) and DATE_FORMAT(create_date,'%Y') = '2020' group by detail_id order by date asc ;

1.建立時間維度表

CREATE TABLE num (i int);-- 建立一個表用來儲存0-9的數字

INSERT INTO num (i) VALUES (0), (1), (2), (3), (4), (5), (6
 
), (7), (8), (9);-- 生成0-9的數字，方便以後計算時間



CREATE TABLE  if not exists calendar(datelist date); -- 生成一個儲存日期的表，datalist是欄位名



-- 這裡是生成並插入日期資料

INSERT INTO calendar(datelist) SELECT

    adddate(

        (   -- 這裡的起始日期，你可以換成當前日期

            DATE_FORMAT("2016-1-1", '%Y-%m-%d') 

        ),

        numlist.id

    ) AS `date`

FROM

    (

        SELECT

            n1.i + n10.i * 10 + n100.i * 100 + n1000.i * 1000+ n10000.i * 10000 AS id
        FROM

            num n1

        CROSS JOIN num AS n10

        CROSS JOIN num AS n100

        CROSS JOIN num AS n1000

        CROSS JOIN num AS n10000

    ) AS numlist;

2.刪除num表
刪除 calendar表中的資料2030年之後

 DELETE from calendar where datelist>'2030-03-14'

3.將datelist設為主鍵

4。sql

select a.date,b.detail_id,b.instant from calendar a left join (
SELECT detail_id, DATE_FORMAT(create_date,'%Y-%m-%d') date,sum(diff_data) instant from  report where detail_id in (3304) and DATE_FORMAT(create_date,'%Y-%m-%d') = '2020-12-16'


) b on  a.date=b.date where a.date='2020-12-16'