SQL come creare più righe da una singola riga

prova:

DECLARE @YourTable table (YourDate datetime, value int)

insert into @YourTable VALUES ('2011-7-12',5)

;WITH AllNumbers AS
(
    SELECT 0 AS Number
    UNION ALL
    SELECT Number+1
        FROM AllNumbers
        WHERE Number<4
)
SELECT 
    dateadd(month,number,DATEADD(month,DATEDIFF(month,0,YourDate),0))
    FROM @YourTable        y
    INNER JOIN AllNumbers  a ON 1=1

uscita:

-----------------------
2011-07-01 00:00:00.000
2011-08-01 00:00:00.000
2011-09-01 00:00:00.000
2011-10-01 00:00:00.000
2011-11-01 00:00:00.000

(5 row(s) affected)

funziona con più righe nella tabella, vedi qui:

DECLARE @YourTable table (YourDate datetime, ValueOf int)

insert into @YourTable VALUES ('2011-7-12',5)
insert into @YourTable VALUES ('2012-4-24',6)

;WITH AllNumbers AS
(
    SELECT 0 AS Number
    UNION ALL
    SELECT Number+1
        FROM AllNumbers
        WHERE Number<4
)
SELECT 
    y.ValueOf
        ,dateadd(month,number,DATEADD(month,DATEDIFF(month,0,y.YourDate),0))
    FROM @YourTable        y
    INNER JOIN AllNumbers  a ON 1=1
    ORDER BY 1,2

USCITA:

ValueOf     
----------- -----------------------
5           2011-07-01 00:00:00.000
5           2011-08-01 00:00:00.000
5           2011-09-01 00:00:00.000
5           2011-10-01 00:00:00.000
5           2011-11-01 00:00:00.000
6           2012-04-01 00:00:00.000
6           2012-05-01 00:00:00.000
6           2012-06-01 00:00:00.000
6           2012-07-01 00:00:00.000
6           2012-08-01 00:00:00.000

(10 row(s) affected)

Inoltre, non ho SQL Server 2008 disponibile, quindi ho usato datetime, se hai 2008, puoi usare DATE datatype e non devi impostare datetime, quindi usa questa riga:

dateadd(month,number,y.YourDate)