mysql中生成时间维度表

来源：互联网发布：证券行业知乎编辑：程序博客网时间：2024/05/04 04:46

mysql中生成时间维度表

利用mysql常用日期函数生成时间维度表，效率最高，最简单，无需其他的一些工具支持。生成结果示例如下图：

# time spanSET @d0 = "2012-01-01";SET @d1 = "2012-12-31"; SET @date = date_sub(@d0, interval 1 day); # set up the time dimension tableDROP 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 datesINSERT INTO time_dimensionSELECT @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_nameFROM TWHERE date_add(@date, interval 1 day) <= @d1ORDER BY date;

神秘的表T，仅仅需要有多于你需要生成日期的记录数即可。思路是从T表选择多行数据，同时生成对应的日期字段。

1 0