sql server - Calculate percentage variation of values of current year and previous year for the same period in SQL -


i have data in database contains values corresponding each date. need calculate percentage variation in count of values of current year , previous year same period. period mean january first current date in year. how in sql. using sql server. table structure this.

id          |  date    -------------------------   1xxxxx      |  01-01-2014   2xxxxx      |  14-01-2014   3xxxxx      |  01-03-2014   4xxxxx      |  12-10-2014   5xxxxx      |  01-12-2014   6xxxxx      |  02-03-2015   7xxxxx      |  04-03-2015   8xxxxx      |  11-04-2015

try this:

declare    @today date,   @prev_year_today date,   @this_year_count int,   @prev_year_count int,   @percentage_change float  set @today = getdate() set @prev_year_today = dateadd(year, -1, @today)  select    @this_year_count = count(*)     some_values    year <= @today ,   datepart(year, year) = datepart(year, @today)  select   @prev_year_count = count(*)   some_values   year <= @prev_year_today ,   datepart(year, year) = datepart(year, @prev_year_today)   set @percentage_change = 100.00 * (@this_year_count - @prev_year_count) / @prev_year_count  select @percentage_change

sqlfiddle


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