获取SQL Server中给定月份和年份的所有日期

Question

我希望通过在SQL server中声明月份和年份来获取所有日期.

任何人都可以分享简单的SQL代码行来获取它.

例如:

DECLARE @month AS INT = 5
DECLARE @Year AS INT = 2016
SELECT * from Something

我试过下面的事情,

DECLARE @month TINYINT=5

;WITH CTE_Days AS (
    SELECT DATEADD(
               MONTH,
               @month,
               DATEADD(
                   MONTH,
                   -MONTH(GETDATE()),
                   DATEADD(
                       DAY,
                       -DAY(GETDATE()) + 1,
                       CAST(FLOOR(CAST(GETDATE() AS FLOAT)) AS DATETIME)
                   )
               )
           ) Dates
    UNION ALL
    SELECT DATEADD(DAY, 1, Dates)
    FROM   CTE_Days
    WHERE  Dates < DATEADD(
               DAY,
               -1,
               DATEADD(
                   MONTH,
                   1,
                   DATEADD(
                       MONTH,
                       @month,
                       DATEADD(
                           MONTH,
                           -MONTH(GETDATE()),
                           DATEADD(
                               DAY,
                               -DAY(GETDATE()) + 1,
                               CAST(FLOOR(CAST(GETDATE() AS FLOAT)) AS DATETIME)
                           )
                       )
                   )
               )
           )
)
SELECT Dates
FROM   CTE_Days

但我正在寻找简单的解决方案,减少线路和简短的答案

Answer 1

你只能通过声明月份来获得所有的日子,因为闰年​​你需要添加年份:

DECLARE @date DATE = getdate()

;WITH N(N)AS 
(SELECT 1 FROM(VALUES(1),(1),(1),(1),(1),(1))M(N)),
tally(N)AS(SELECT ROW_NUMBER()OVER(ORDER BY N.N)FROM N,N a)
SELECT top(day(EOMONTH(@date)))
  N day,
  dateadd(d,N-1, @date) date
FROM tally

另一个不同的解决方案(由t @ clausen提供):

DECLARE @month AS INT = 5
DECLARE @Year AS INT = 2016

;WITH N(N)AS 
(SELECT 1 FROM(VALUES(1),(1),(1),(1),(1),(1))M(N)),
tally(N)AS(SELECT ROW_NUMBER()OVER(ORDER BY N.N)FROM N,N a)
SELECT N day,datefromparts(@year,@month,N) date FROM tally
WHERE N <= day(EOMONTH(datefromparts(@year,@month,1)))

Answer 2

与t-clausen相同的方法，但更紧凑：

Declare @year int = 2017, @month int = 11;
WITH numbers
as
(
    Select 1 as value
    UNion ALL
    Select value + 1 from numbers
    where value + 1 <= Day(EOMONTH(datefromparts(@year,@month,1)))
)
SELECT datefromparts(@year,@month,numbers.value) Datum FROM numbers