Date ranges in T/SQL

Question

For a current project I am working I need to return an aggregate report based on date ranges.

I have 3 types of reports, yearly, monthly and daily.

To assis

Answer 1

There are quite a few tricks in here, hope you find it useful

create function dbo.fnGetDateRanges
(
    @type char(1),
    @start datetime,
    @finish datetime
)
returns @ranges table(start datetime, finish datetime)
as 
begin

    declare @from datetime 
    declare @to datetime 
    set @from = @start 

    if @type = 'd'
    begin 
        set @to = dateadd(day, 1,
                convert
                (   datetime,
                    cast(DatePart(d,@start) as varchar) + '/' + cast(DatePart(m,@start) as varchar) + '/' + cast(DatePart(yy,@start) as varchar),
                    103
                )
            )
    end

    if @type = 'm'
    begin
        set @to = dateadd(month, 1, 
            convert
            (   
                datetime,
                '1/' + cast(DatePart(m,@start) as varchar) + '/' + cast(DatePart(yy,@start) as varchar),
                103
            )
        )
    end 

    if @type = 'y'
    begin
        set @to = dateadd(year, 1, 
            convert
            (   
                datetime,
                '1/1/' + cast(DatePart(yy,@start) as varchar),
                103
            )
        )
    end 

    while @to < @finish
    begin 
        insert @ranges values (@from, @to)
        set @from = @to 
        if @type = 'd'
            set @to = dateadd(day, 1, @to)
        if @type = 'm'
            set @to = dateadd(month, 1, @to)
        if @type = 'y'
            set @to = dateadd(year, 1, @to)
    end

    insert @ranges values (@from, @finish)

    return 
end