sqlServer利用递归查询--将日期范围转换为日期表

-- 创建日期表
CREATE TABLE #DateTable
(TheDate DATE NOT NULL PRIMARY KEY
);-- 插入日期序列
DECLARE @StartDate DATE = '2021-01-01', @EndDate DATE = '2021-12-31';WITH DateSequence(Date) AS
(SELECT CAST(@StartDate AS DATE) AS DateUNION ALLSELECT DATEADD(DAY, 1, Date)FROM DateSequenceWHERE DATEADD(DAY, 1, Date) <= @EndDate
)
INSERT INTO #DateTable(TheDate)
SELECT Date
FROM DateSequence
OPTION (MAXRECURSION 0); -- 移除递归限制select * from #DateTable

ALTER FUNCTION [dbo].[fn_GenerateDates]
(@StartDate DATETIME, @EndDate DATETIME
)RETURNS @Output TABLE 
(Value NVARCHAR(4000)
) 
ASBEGININSERT INTO @Output    SELECT TOP (DATEDIFF(Day, @StartDate, @EndDate)+1) CONVERT(VARCHAR(10), YEAR(DATEADD(Day, number, @StartDate))) + '-' + DATENAME(MONTH, DATEADD(Day, number, @StartDate)) + '-' + DATENAME(Day, DATEADD(Day, number, @StartDate)) AS MonthsFROM [master].dbo.spt_values WHERE [type] = N'P' ORDER BY numberRETURN
END

--select Value from [dbo].fn_GenerateDates('2021-02-01','2021-02-15')

--select Value from [dbo].fn_GenerateDates('2020-01-01','2024-12-31')