根据记录值转换为行数

Question

我有一个场景，我目前被困在

table abc having amount,fromdate,todate,numberofquarters(从todate fromdate计算)

示例：

amount  fromdate    todate      numberofquarters

140    01/01/2011   06/01/2014   14

我必须按季度按比例完成上述 table 即 14 条记录为

amount  fromdate    todate      
10     01/01/2011   03/31/2011   
10     01/04/2011   06/30/2011   
10     01/07/2011   09/31/2011   
10     01/10/2011   12/31/2011  
10     01/01/2012   03/31/2012   
10     01/04/2012   06/30/2012   
10     01/07/2012   09/31/2012   
10     01/10/2012   12/31/2012  
10     01/01/2013   03/31/2013   
...and so on

请建议我可以在不使用游标的情况下实现结果的任何方法。

Answer 1

你可以通过永久日期或数字 table（每个日期或数字一行）来做这样的事情，或者动态地构造它，像这样：

;WITH lv0 AS (SELECT 0 g UNION ALL SELECT 0)
    ,lv1 AS (SELECT 0 g FROM lv0 a CROSS JOIN lv0 b) -- 4
    ,lv2 AS (SELECT 0 g FROM lv1 a CROSS JOIN lv1 b) -- 16
    ,lv3 AS (SELECT 0 g FROM lv2 a CROSS JOIN lv2 b) -- 256
    ,Tally (n) AS (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM lv3)
SELECT 
  abc.amount / numberofquarters, 
  dateadd(month, (n-1)*3, abc.fromdate) as fromdate,
  dateadd(day, -1, dateadd(month, n*3, abc.fromdate)) as todate
FROM 
  Tally T 
  join abc on abc.numberofquarters >= T.N
Order by fromdate

这将创建一个包含 256 行的 table，如果您需要更多季度，则只需在 CTE 中再添加一个类似的联接。然后将其与 abc 结合，以便该数字用于将月份添加到开始日期。

SQL Fiddle

中的示例

Answer 2

假设期望输出：
金额 = 金额列的总和，
fromdate = fomdate 列的最小值，
todate = todate 列的最小值季度不会跨越多年。

SELECT
    amount,
    fromdate,
    todate,
    COUNT(DISTINCT CASE 
       WHEN DATEPART(DAY, fromdate) > DATEPART(DAY, todate)
       THEN DATEDIFF(MONTH, fromdate, todate) - 1
       ELSE DATEDIFF(MONTH, fromdate, todate)
    END % 3 + YEAR(fromdate)) quarters
FROM (
    SELECT 
      SUM(amount) amount,
      MIN(fromdate) fromdate, 
      MAX(todate) todate
      FROM abc
 ) subq

应该会给你想要的结果

根据记录值转换为行数

Convert to number of rows based on record value

tsql

sql-server

ssis