在我的旧数据库中,有一个表 Album
存储有关 ID、AlbumName、Release_Date(例如 01/01/2017)等信息。
我想将Release_Date
进一步分解成一个时间维度表,所以我创建了一个DimDateAlbum
表。
这是我创建的时间维度表。
CREATE TABLE [DimDateAlbum]
(
[DateKey] INT PRIMARY KEY,
[Date] DATETIME NOT NULL,
[Year] INT NOT NULL,
[Quarter] TINYINT NOT NULL,
[QuarterName] VARCHAR(6) NOT NULL, -- January to March: First, April to
June: Second etc
[Month] TINYINT NOT NULL,
[MonthName] VARCHAR(9) NOT NULL, -- January, February etc
[Day] TINYINT NOT NULL, -- Field holds day number of Month
[DayofWeek] TINYINT NOT NULL,
[WeekName] VARCHAR(9) NOT NULL, -- Field displays 1: Monday, 2: Tuesday etc
)
如下所述:我可以将 Release_Date
作为 [DateKey]
插入到时间维度表中,但是,如何将日期进一步分割为年、季度、日等等?
INSERT INTO DimDateAlbum
SELECT
a.Release_Date AS [DateKey],
CONVERT (char(8), a.Release_Date, 112) AS [DateKey],
a.Release_Date AS [Date],
DATEPART(YEAR, a.Release_Date) AS [Year], -- calendar year
DATEPART(QQ, a.Release_Date) AS [Quarter], -- calendar quarter
CASE (qq, a.Release_Date)
WHEN 1 THEN 'First'
WHEN 2 THEN 'Second'
WHEN 3 THEN 'Third'
WHEN 4 THEN 'Fourth'
END AS [QuarterName],
DATEPART(MONTH, a.Release_Date) AS [Month], -- month number of the year
DATENAME(MM, a.Release_Date) AS [MonthName], -- month name
DATEPART(DAY, a.Release_Date) AS [Day], -- day number of the month
DATEPART(DW, a.Release_Date) AS [DayofWeek], -- day number of week
CASE datepart(DW, a.Release_Date)
WHEN 1 THEN 'Monday'
WHEN 2 THEN 'Tuesday'
WHEN 3 THEN 'Wednesday'
WHEN 4 THEN 'Thursday'
WHEN 5 THEN 'Friday'
WHEN 6 THEN 'Saturday'
WHEN 7 THEN 'Sunday'
END AS [WeekName]
FROM
dbo.Album AS a
此代码不起作用,请问如何解决?非常感谢!
最佳答案
如果我理解正确的话,您想要填充 DimDateAlbum
表。我已经对您的表进行了一些编辑(添加了身份约束以避免手动编写此字段),现在它看起来像这样:
CREATE TABLE [DimDateAlbum]
(
[DateKey] INT IDENTITY CONSTRAINT PK_DimDateAlbum_ID PRIMARY KEY,
[Date] DATETIME NOT NULL,
[Year] INT NOT NULL,
[Quarter] TINYINT NOT NULL,
[QuarterName] VARCHAR(50) NOT NULL, -- January to March: First, April to
[Month] TINYINT NOT NULL,
[MonthName] VARCHAR(9) NOT NULL, -- January, February etc
[Day] TINYINT NOT NULL, -- Field holds day number of Month
[DayofWeek] TINYINT NOT NULL,
[WeekName] VARCHAR(50) NOT NULL, -- Field displays 1: Monday, 2: Tuesday etc
)
现在您可以插入数据了。我添加了一个测试变量来插入一行,但它可用于从表中插入:
INSERT INTO dbo.DimDateAlbum
(
DateKey,
Date,
Year,
Quarter,
QuarterName,
Month,
MonthName,
Day,
DayofWeek,
WeekName
)
SELECT
CAST(a.Release_Date AS DATETIME)
, YEAR(CAST(a.Release_Date AS DATETIME)) --
, DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) -- Quarter
, CASE -- Quarter Name
WHEN DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) = 1 THEN 'January to March' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) = 2 THEN 'April to June' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) = 3 THEN 'July to September' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) = 4 THEN 'October to December' -- Quarter Name
END
, MONTH(CAST(a.Release_Date AS DATETIME)) -- Month number
, DATENAME(MONTH, DATEADD( MONTH, MONTH(CAST(a.Release_Date AS DATETIME)), 0) - 1) -- Month name
, DAY(CAST(a.Release_Date AS DATETIME)) -- 6
, DATEPART(dw, CAST(a.Release_Date AS DATETIME)) -- 5
, DATENAME(dw, CAST(a.Release_Date AS DATETIME)) -- Thursday
FROM Album a
工作示例:
DECLARE @FooDate VARCHAR(30) = '2018-12-06 12:10:51.727'
INSERT INTO dbo.DimDateAlbum
(
DateKey,
Date,
Year,
Quarter,
QuarterName,
Month,
MonthName,
Day,
DayofWeek,
WeekName
)
SELECT
CAST(@FooDate AS DATETIME)
, YEAR(CAST(@FooDate AS DATETIME)) --
, DATEPART(QUARTER, CAST(@FooDate AS DATETIME)) -- Quarter
, CASE -- Quarter Name
WHEN DATEPART(QUARTER, CAST(@FooDate AS DATETIME)) = 1 THEN 'January to March' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(@FooDate AS DATETIME)) = 2 THEN 'April to June' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(@FooDate AS DATETIME)) = 3 THEN 'July to September' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(@FooDate AS DATETIME)) = 4 THEN 'October to December' -- Quarter Name
END
, MONTH(CAST(@FooDate AS DATETIME)) -- Month number
, DATENAME(MONTH, DATEADD( MONTH, MONTH(CAST(@FooDate AS DATETIME)), 0) - 1) -- Month name
, DAY(CAST(@FooDate AS DATETIME)) -- 6
, DATEPART(dw, CAST(@FooDate AS DATETIME)) -- 5
, DATENAME(dw, CAST(@FooDate AS DATETIME)) -- Thursday
关于sql-server - 如何使用 SQL Server 使用 ETL 存储过程提取数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53646786/