在 mysql 中生成时间维度

Question

我正在尝试使用以下字段制作 mysql table：年月日时分

从10年前到未来10年。

我有这个可以创建几天，但它不包括小时和分钟

SET @d0 = "2012-01-01";
SET @d1 = "2012-12-31";

SET @date = date_sub(@d0, interval 1 day);

# set up the time dimension table
DROP TABLE IF EXISTS time_dimension;
CREATE TABLE `time_dimension` (
`date` date DEFAULT NULL,
`id` int NOT NULL,
`y` smallint DEFAULT NULL,
`m` smallint DEFAULT NULL,
`d` smallint DEFAULT NULL,
`yw` smallint DEFAULT NULL,
`w` smallint DEFAULT NULL,
`q` smallint DEFAULT NULL,
`wd` smallint DEFAULT NULL,
`m_name`  char(10) DEFAULT NULL,
`wd_name` char(10) DEFAULT NULL,
PRIMARY KEY (`id`)
);

# populate the table with dates
INSERT INTO time_dimension
SELECT @date := date_add(@date, interval 1 day) as date,
# integer ID that allows immediate understanding
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 T
WHERE date_add(@date, interval 1 day) <= @d1
ORDER BY date
;

我如何修改它，使它也能显示小时和分钟？谢谢！

Answer 1

如果您选择时间维度，建议您将日期维度和时间维度分开，合并这两个维度将导致您的维度超过 10m 条记录，而将日期维度和时间维度分开将为您提供 7300 行的日期维度和时间维度的 1440 行 (hour/minute) 然后，您将需要在您的事实 table 中使用时间维度的外键，就像您使用日期维度设计它一样。

Answer 2

这是我正在使用的

DROP TABLE IF EXISTS time_dimension;
CREATE TABLE time_dimension (
        id                      INTEGER PRIMARY KEY,  -- year*10000+month*100+day
        db_date                 DATE NOT NULL,
        year                    INTEGER NOT NULL,
        month                   INTEGER NOT NULL, -- 1 to 12
        day                     INTEGER NOT NULL, -- 1 to 31
        quarter                 INTEGER NOT NULL, -- 1 to 4
        week                    INTEGER NOT NULL, -- 1 to 52/53
        day_name                VARCHAR(9) NOT NULL, -- 'Monday', 'Tuesday'...
        month_name              VARCHAR(9) NOT NULL, -- 'January', 'February'...
        holiday_flag            CHAR(1) DEFAULT 'f' CHECK (holiday_flag in ('t', 'f')),
        weekend_flag            CHAR(1) DEFAULT 'f' CHECK (weekday_flag in ('t', 'f')),
        UNIQUE td_ymd_idx (year,month,day),
        UNIQUE td_dbdate_idx (db_date)

) Engine=MyISAM;

DROP PROCEDURE IF EXISTS fill_date_dimension;
DELIMITER //
CREATE PROCEDURE fill_date_dimension(IN startdate DATE,IN stopdate DATE)
BEGIN
    DECLARE currentdate DATE;
    SET currentdate = startdate;
    WHILE currentdate <= stopdate DO
        INSERT INTO time_dimension VALUES (
            YEAR(currentdate)*10000+MONTH(currentdate)*100 + DAY(currentdate),
            currentdate,
            YEAR(currentdate),
            MONTH(currentdate),
            DAY(currentdate),
            QUARTER(currentdate),
            WEEKOFYEAR(currentdate),
            DATE_FORMAT(currentdate,'%W'),
            DATE_FORMAT(currentdate,'%M'),
            'f',
            CASE DAYOFWEEK(currentdate) WHEN 1 THEN 't' WHEN 7 then 't' ELSE 'f' END
            );
        SET currentdate = ADDDATE(currentdate,INTERVAL 1 DAY);
    END WHILE;
END
//
DELIMITER ;

TRUNCATE TABLE time_dimension;
CALL fill_date_dimension('1800-01-01','2050-01-01');
OPTIMIZE TABLE time_dimension;

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