mysql生成日期 星期表_mysql生成日期的辅助表

为了解决mysql按日期分组查询统计的时候，没有数据补0。可以生成连续的时间表格来辅助查询

CREATE TABLE num (i int);-- 创建一个表用来储存0-9的数字INSERT INTO num (i) VALUES (0), (1), (2), (3), (4), (5), (6), (7), (8), (9);-- 生成0-9的数字,方便以后计算时间

* 生成日期

CREATE TABLE num (i int);-- 创建一个表用来储存0-9的数字

INSERT INTO num (i) VALUES (0), (1), (2), (3), (4), (5), (6), (7), (8), (9);

DROP TABLE calendar;

CREATE TABLE if not exists calendar(datelist date,datehour datetime);

INSERT INTO calendar(datelist) SELECT adddate( ( -- 这里的起始日期,你可以换成当前日期

DATE_FORMAT("2018-11-10", ‘%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;

* 每一个小时为一个分段 生成如下辅助表

INSERT INTO calendar(datehour)

SELECT

DATE_ADD((DATE_FORMAT("2018-11-10", ‘%Y-%m-%d‘)),INTERVAL numlist.id HOUR) 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;