如何將一個日期變量轉換爲一個數字是sql？

Question

我有這樣的語句

SELECT @startdate = DATEADD(wk, DATEDIFF(wk,0,GETDATE()), -7) -- Monday of previous week 
SELECT @enddate = DATEADD(wk, DATEDIFF(wk,0,GETDATE()), -1) -- Sunday of previous week 

，我想@startdate和@EndDate轉換爲數字的格式如下「年月日」

Answer 1

SELECT CONVERT(nvarchar(8), @StartDate, 112) 

將轉變2014-03-31到20140331

Answer 2

這會爲你工作：

SELECT CAST(DATEPART(yyyy,@startdate) AS VARCHAR(4)) + 
    RIGHT('0' + CAST(DATEPART(mm,@startdate) AS VARCHAR(2)),2) + 
    RIGHT('0' + CAST(DATEPART(dd,@startdate) AS VARCHAR(2)),2) 

但這是更好的：

SELECT CONVERT(nvarchar(8), @StartDate, 112) 

Answer 3

最簡單方法是使用year()，month()，並且day()：

select @startdate = year(getdate())*10000 + month(getdate()) * 100 + day(getdate()) 

Answer 4

使用convert

declare @enddate smalldatetime 
SELECT @enddate = DATEADD(wk, DATEDIFF(wk,0,GETDATE()), -1) 
select convert(varchar(30), @enddate, 112)