I just need to select the first day of the month of a given DateTime variable.
I know it's quite easy to do using this kind of code:
select CAST(CAST(YEAR(@mydate) AS VARCHAR(4))
+ '/' + CAST(MONTH(@mydate) AS VARCHAR(2)) + '/01' AS DATETIME)
But unfortunately, this is not very elegant, and not very fast either.
Is there a better way to do this? I'm using SQL Server 2008.
