Incremental Week Number in SQL Server -


i trying increase week number week number of year not repeat

for example 18/12/2016 week number 51, 25/12/2016 week number 52 , 01/01/2017 week number 1, 08/01/2017 week number 2.

what want 18/12/2016 week no 51, 25/12/2016 week no 52, week no 53, 08/01/2017 no week 54 etc no week repeat

see sample of dataset , query have tried 

declare @table1 table (week_end_date date)  insert @table1  values ('2016-04-03'), ('2016-04-10'), ('2016-04-17'), ('2016-04-24'),        ('2016-05-01'), ('2016-05-08'), ('2016-05-15'), ('2016-05-22'),        ('2016-05-29'), ('2016-06-05'), ('2016-06-12'), ('2016-06-19'),        ('2016-06-26'), ('2016-07-03'), ('2016-07-10'), ('2016-07-17'),        ('2016-07-24'), ('2016-07-31'), ('2016-08-07'), ('2016-08-14'),        ('2016-08-21'), ('2016-08-28'), ('2016-09-04'), ('2016-09-11'),        ('2016-09-18'), ('2016-09-25'), ('2016-10-02'), ('2016-10-09'),           ('2016-10-16'), ('2016-10-23'), ('2016-10-30'), ('2016-11-06'),        ('2016-11-13'), ('2016-11-20'), ('2016-11-27'), ('2016-12-04'),        ('2016-12-11'), ('2016-12-18'), ('2016-12-25'), ('2017-01-01'),        ('2017-01-08'), ('2017-01-15'), ('2017-01-22'), ('2017-01-29'),           ('2017-02-05'), ('2017-02-12'), ('2017-02-19'), ('2017-02-26'),        ('2017-03-05'), ('2017-03-12'), ('2017-03-19'), ('2017-03-26'),        ('2017-04-02'), ('2017-04-09'), ('2017-04-16'), ('2017-04-23'),        ('2017-04-30'), ('2017-05-07'), ('2017-05-14'), ('2017-05-21'),        ('2017-05-28'), ('2017-06-04'), ('2017-06-11'), ('2017-06-18'),        ('2017-06-25'), ('2017-07-02'), ('2017-07-09'), ('2017-07-16'),        ('2017-07-23'), ('2017-07-30'), ('2017-08-06'), ('2017-08-13'),        ('2017-08-20'), ('2017-08-27'), ('2017-09-03'), ('2017-09-10'),        ('2017-09-17'), ('2017-09-24'), ('2017-10-01'), ('2017-10-08'),        ('2017-10-15'), ('2017-10-22'), ('2017-10-29'), ('2017-11-05'),        ('2017-11-12'), ('2017-11-19'), ('2017-11-26'), ('2017-12-03'),        ('2017-12-10'), ('2017-12-17'), ('2017-12-24'), ('2017-12-31'),        ('2018-01-07'), ('2018-01-14'), ('2018-01-21'), ('2018-01-28'),        ('2018-02-04'), ('2018-02-11'), ('2018-02-18'), ('2018-02-25'),        ('2018-03-04'), ('2018-03-11'), ('2018-03-18'), ('2018-03-25'),        ('2018-04-01')

query:

select     week_end_date,     datepart(week,week_end_date) weeknumber,     replace(left(week_end_date,7),'-','') +          case              when cast(datepart(week, week_end_date) varchar(2)) in ('1', '2', '3', '4', '5', '6', '7', '8', '9')                 '0' + cast(datepart(week, week_end_date) varchar(2))                 else cast(datepart(week, week_end_date) varchar(2))          end wk_no_norepeat      @table1  order      week_end_date

desired output

date    current week number expected output 04/12/2016  49  49 11/12/2016  50  50 18/12/2016  51  51 25/12/2016  52  52 01/01/2017  1   53 08/01/2017  2   54 15/01/2017  3   55 22/01/2017  4   56 29/01/2017  5   57

you use row_number(). if understand correctly may use like:

declare @table1 table (week_end_date date)  insert @table1  values ('2016-04-03'), ('2016-04-10'), ('2016-04-17'), ('2016-04-24'),        ('2016-05-01'), ('2016-05-08'), ('2016-05-15'), ('2016-05-22'),        ('2016-05-29'), ('2016-06-05'), ('2016-06-12'), ('2016-06-19'),        ('2016-06-26'), ('2016-07-03'), ('2016-07-10'), ('2016-07-17'),        ('2016-07-24'), ('2016-07-31'), ('2016-08-07'), ('2016-08-14'),        ('2016-08-21'), ('2016-08-28'), ('2016-09-04'), ('2016-09-11'),        ('2016-09-18'), ('2016-09-25'), ('2016-10-02'), ('2016-10-09'),           ('2016-10-16'), ('2016-10-23'), ('2016-10-30'), ('2016-11-06'),        ('2016-11-13'), ('2016-11-20'), ('2016-11-27'), ('2016-12-04'),        ('2016-12-11'), ('2016-12-18'), ('2016-12-25'), ('2017-01-01'),        ('2017-01-08'), ('2017-01-15'), ('2017-01-22'), ('2017-01-29'),           ('2017-02-05'), ('2017-02-12'), ('2017-02-19'), ('2017-02-26'),        ('2017-03-05'), ('2017-03-12'), ('2017-03-19'), ('2017-03-26'),        ('2017-04-02'), ('2017-04-09'), ('2017-04-16'), ('2017-04-23'),        ('2017-04-30'), ('2017-05-07'), ('2017-05-14'), ('2017-05-21'),        ('2017-05-28'), ('2017-06-04'), ('2017-06-11'), ('2017-06-18'),        ('2017-06-25'), ('2017-07-02'), ('2017-07-09'), ('2017-07-16'),        ('2017-07-23'), ('2017-07-30'), ('2017-08-06'), ('2017-08-13'),        ('2017-08-20'), ('2017-08-27'), ('2017-09-03'), ('2017-09-10'),        ('2017-09-17'), ('2017-09-24'), ('2017-10-01'), ('2017-10-08'),        ('2017-10-15'), ('2017-10-22'), ('2017-10-29'), ('2017-11-05'),        ('2017-11-12'), ('2017-11-19'), ('2017-11-26'), ('2017-12-03'),        ('2017-12-10'), ('2017-12-17'), ('2017-12-24'), ('2017-12-31'),        ('2018-01-07'), ('2018-01-14'), ('2018-01-21'), ('2018-01-28'),        ('2018-02-04'), ('2018-02-11'), ('2018-02-18'), ('2018-02-25'),        ('2018-03-04'), ('2018-03-11'), ('2018-03-18'), ('2018-03-25'),        ('2018-04-01')  declare @firstweek int = (select datepart(week,min(week_end_date))-1 @table1)  select     week_end_date,     row_number() on (order week_end_date)+@firstweek weeknumber      @table1

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