遍历行并在临时表中插入数据 - SQL Server 2008

Question

我有一些数据如下

Duration        Start Date
==========================
2               11/11/2014
1               11/6/2014
3               11/22/2014

我想迭代到上面所有三行,并产生如下输出

Date
===========
11/11/2014
11/12/2014
11/6/2014
11/22/2014
11/23/2014
11/24/2014

将开始日期按持续时间增加日期,并为每个日期创建单独的行

Answer 1

不要迭代但使用基于集合的方法,如...

WITH Nums AS(
    SELECT DISTINCT Value = number 
    FROM master..[spt_values] 
)
SELECT Date = DATEADD(d, n.Value - 1, t.[Start Date])
FROM Nums n CROSS JOIN TableName t
WHERE n.Value BETWEEN 1 AND t.Duration

演示

请注意,此方法仅适用于2,164.另一种方法是使用数字表.读:

http://sqlperformance.com/2013/01/t-sql-queries/generate-a-set-1

如果要将其插入另一个表,可以这样使用它:

WITH Nums AS(
    SELECT DISTINCT Value = number 
    FROM master..[spt_values] 
)
INSERT INTO #TempTable ([Date]) 
SELECT Date = DATEADD(d, n.Value - 1, t.[Start Date])
FROM Nums n CROSS JOIN TableName t
WHERE n.Value BETWEEN 1 AND t.Duration