[sql-server] SQL Server: convert ((int)year,(int)month,(int)day) to Datetime

Possible Duplicate:
Create a date with T-SQL

I've a data table that stores each year, month and day value as ints:

year | month | day
2009 |   1   |  1 
2008 |  12   |  2
2007 |   5   |  5

I need to convert it to datetime value, because I need to use it in a datetime between operation. How could I do this?

You could convert your values into a 'Decimal' datetime and convert it then to a real datetime column:

select cast(rtrim(year *10000+ month *100+ day) as datetime) as Date from DateTable

See here as well for more info.

Pure datetime solution, does not depend on language or DATEFORMAT, no strings

SELECT
    DATEADD(year, [year]-1900, DATEADD(month, [month]-1, DATEADD(day, [day]-1, 0)))
FROM
    dbo.Table

SELECT CAST(CAST(year AS varchar) + '/' + CAST(month AS varchar) + '/' + CAST(day as varchar) AS datetime) AS MyDateTime
FROM table