參數日期之間的週數 - 逐組 - SQL

Question

我在我的存儲過程@FromDate和@ToDate中有2個參數，我想弄清@FromDate和@ToDate之間的週數，@FromDate總是一個週一同時@ToDate始終是一個星期天，但日期可以覆蓋周，月等

目前我有DATEDIFF（WW，@FromDate，@ToDate）

它返回說4，但我想它返回1,2,3行和4行，而不是隻有一行。

達到此目的的最佳方法是什麼？

Answer 1

如果我猜中了：

With T(Number) as 
(
    Select 0 as Number 
     union all 
    Select Number + 1 
     from T 
     where Number < DATEDIFF(WW, @FromDate, @ToDate) 

) 

SELECT NUMBER FROM T WHERE Number>0; 

SQLFiddle demo

Answer 2

DECLARE @StartDate DATETIME 
DECLARE @EndDate DATETIME 

SET @StartDate = GETUTCDATE() - 90 
SET @EndDate = GETUTCDATE() 

DECLARE @WeekNumber INT 

SET @WeekNumber = DATEDIFF(WW, @StartDate, @EndDate) ; 

WITH CTE_WeekNumber (WeekNumber) 

     AS (SELECT 1 
      WHERE @WeekNumber >= 1 
      UNION ALL 
      SELECT WeekNumber + 1 
      FROM  CTE_WeekNumber 
      WHERE @WeekNumber >= WeekNumber + 1 
     ) 

SELECT * 
FROM CTE_WeekNumber