我对postgres和DW还不熟悉,我必须设计一个DATE Dimension
,如book所示。我在网上看到了很多地方,但到目前为止还没有成功,能否解释一下如何填充'Fiscal Week', 'Fiscal Month', 'Fiscal Half year'
谢谢你
最佳答案
我想您需要10年日期维度表,其中所有列都显示在图2.4中(基于Google Books)。签入文档:
模板模式的格式化函数to_char
提取功能Table 9-21
生成date_part
的行序列
为了在10年内得到所有的时间,你可以写:
SELECT generate_series('2001-01-01'::date, '2010-12-31'::date, '1 day') AS day;
SELECT count(*) FROM generate_series('2001-01-01'::date, '2010-12-31'::date, '1 day');
count
-------
3652
(1 row)
根据图2.5创建表,例如:
DROP TABLE IF EXISTS "Date Dimension";
CREATE TABLE "Date Dimension"
(
"Date Key" serial,
"Date" date,
"Full Day Description" text,
"Day Of Week" text,
"Calendar Month" text,
"Calendar Year" integer,
"Fiscal Year Month" text,
"Holiday Indicator" text,
"Weekday Indicator" text
);
插入命令:
INSERT INTO "Date Dimension"
("Date", "Full Day Description", "Day Of Week", "Calendar Month",
"Calendar Year", "Fiscal Year Month", "Holiday Indicator",
"Weekday Indicator")
SELECT
day,
rtrim(to_char(day, 'Month')) || to_char(day, ' DD, YYYY'),
to_char(day, 'Day'),
rtrim(to_char(day, 'Month')),
date_part('year', day),
'F' || to_char(day, 'YYYY-MM'),
'', --omitting (trivial 'Holiday'/'Non-Holiday, but how to get this ??),
CASE
WHEN date_part('isodow', day) IN (6, 7) THEN 'Weekend'
ELSE 'Weekday'
END
FROM
generate_series('2001-01-01'::date, '2010-12-31'::date, '1 day') day;
我希望这能给你一些框架和起点。