# ---- 对应时间戳怎么生成的? ----
/*
TIME_CD TIME_CD1
000000 000005
000001 000005
000002 000005
000003 000005
000004 000005
000005 000010
*/
利用MySQL常用日期函数生成时间维度表
- 日期时间函数
- 按小时、按分钟、按秒生成
SELECT STR_TO_DATE('September 02, 2016','%M %d, %Y') AS DATE; # 2016-09-02
SELECT CURRENT_DATE(), CURRENT_TIME(), CURRENT_TIMESTAMP;
# 2018-05-29 01:00:54 2018-05-29 01:00:54
MySQL快速生成时间维度表
SET @d0 = '2018-01-01';
SET @d1 = '2018-12-31';
SET @date = DATE_SUB(@d0, INTERVAL 1 DAY);
USE test;
CREATE TABLE aa_time_dim(
DATE DATE DEFAULT NULL,
id INT(11) NOT NULL,
Y SMALLINT(6) DEFAULT NULL,
m SMALLINT(6) DEFAULT NULL,
d SMALLINT(6) DEFAULT NULL,
yw SMALLINT(6) DEFAULT NULL,
w SMALLINT(6) DEFAULT NULL,
q SMALLINT(6) DEFAULT NULL,
wd SMALLINT(6) DEFAULT NULL,
m_name CHAR(10) DEFAULT NULL,
wd_name CHAR(10) DEFAULT NULL,
PRIMARY KEY (id))ENGINE = INNODB DEFAULT CHARSET = utf8;
SELECT * FROM aa_time_dim;
INSERT INTO aa_time_dim
SELECT
@date := DATE_ADD(@date, INTERVAL 1 DAY) AS DATE,
DATE_FORMAT(@date, '%Y%m%d') AS id,
YEAR(@date) AS Y,
MONTH(@date) AS m,
DAY(@date) AS d,
DATE_FORMAT(@date, '%x') AS yw,
WEEK(@date,3) AS w,
QUARTER(@date) AS q,
WEEKDAY(@date) + 1 AS wd,
MONTHNAME(@date) AS m_name,
DAYNAME(@date) AS wd_name
FROM xxx
WHERE DATE_ADD(@date,INTERVAL 1 DAY) <= @d1
ORDER BY DATE;
SELECT * FROM aa_time_dim;
DROP TABLE aa_time_dim;
注意:此处的表xxx,仅仅需要有多于需要生成日期的记录数即可。思路是从xxx表选择多行数据,同时生成对应的日期字段。
结果:
END 2018-05-29 01:15:25