mysql中生成時間維度表

利用mysql常用日期函數生成時間維度表，效率最高，最簡單，無需其他的一些工具支持。生成結果示例如下圖：

# time span

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 allowsimmediate 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

;

神秘的表T，僅僅需要有多于你需要生成日期的記錄數即可。思路是從T表選擇多行數據，同時生成對應的日期字段。

總結

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