Special Date Functions in SQL, Part 1

For our internal dashboard work, we're looking at metrics for the previous month. While I could create a SQL Server stored procedure to pass these dates from a user form, I really want to create a SQL view that will show last month's information. That way, whenever the view is opened, it always shows data for last month.

I know in VB that there are FirstDayOfMonth and LastDayOfMonth functions, but I've been unable to find similar functions in SQL. In my research, I've found "Date and Time Manipulation in SQL Server 2000" helpful. I came up with this SQL:

SELECT
CAST(CONVERT(CHAR(10), DATEADD(dd,-(DAY(GETDATE())-1),GETDATE()),101) AS smalldatetime) AS StartDate,
CAST(CONVERT(CHAR(10), DATEADD(dd,-(DAY(DATEADD(mm,1,GETDATE()))),DATEADD(mm,1,GETDATE())),101) AS smalldatetime) AS EndDate,
CAST(CONVERT(CHAR(10), DATEADD(dd,-(DAY(DATEADD(mm,-1,GETDATE()))-1),DATEADD(mm,-1,GETDATE())),101) AS smalldatetime) AS PrevMonthStartDate,
CAST(CONVERT(CHAR(10), DATEADD(dd,-(DAY(DATEADD(mm,1,GETDATE()))),GETDATE()),101) AS smalldatetime) AS PrevMonthEndDate

It returns these results:

StartDate	EndDate	PrevMonthStartDate	PrevMonthEndDate
2008-08-01 00:00:00	2008-08-31 00:00:00	2008-07-01 00:00:00	2008-07-31 00:00:00

The SQL seems a bit convoluted, especially since I'm going to be using the start and end dates as criteria in a WHERE clause. So, I'm going to create a User-Defined Function (UDF) for each. I'll share scripts for those in a follow-up post.

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