Dates

I have been using the following date ranges in queries for several months now, using SQL 2008 R2

declare @range varchar(20), @start datetime, @end datetime

if @range='Today'
   select @start= floor(CONVERT(float,getdate())), @end=getdate()
else if @range='Yesterday'
   select @end= floor(CONVERT(float,getdate())), @start=@end-1
else if @range='Last 5 Days'
   select @end= floor(CONVERT(float,getdate())), @start=@end-5
else if @range='Last 7 Days'
   select @end= floor(CONVERT(float,getdate())), @start=@end-7
else if @range='Month To Date'
   select @end=GETDATE(), @start= DATEADD(d,1-DAY(getdate()),floor(CONVERT(float,getdate())))
else if @range='Last Month'
   select @end= DATEADD(d,1-DAY(getdate()),floor(CONVERT(float,getdate()))), @start=DATEADD(m,-1,@end)

The query is usually

select etc
from ect
where fielddate between @start and @end

My questions is in two parts

- Is the way I am doing correct/efficient or is there a better way of doing this?
- I also need the date ranges for Last Full Week - in this case Mon - Sun, Last Full Year, Year to Date

Thanks
Mark WilsonBI DeveloperAsked:
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QPRCommented:
I'm confused as to why you are converting the dates to a floor.
Why aren't you treating date variables as date data types?

There are some examples of getting date values/ranges here
http://blog.sqlauthority.com/2008/08/29/sql-server-few-useful-datetime-functions-to-find-specific-dates/
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QPRCommented:
umm I meant converting to a float not a floor
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Microsoft SQL Server 2008

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