sql server - SQL CASE statement with boolean operator -


see statement:

select      t1.region,              count(t1.orders) as orders,              case t1.week                        when < '5' then 'apr'                        when < '10' then 'may'                        when < '14' then 'jun'                        when < '19' then 'jul'                        when < '23' then 'aug'                        when < '27' then 'sep'                        when < '32' then 'oct'                        when < '36' then 'nov'                        when < '40' then 'dec'                        when < '45' then 'jan'                        when < '49' then 'feb'                        when < '53' then 'mar'              end as month,              dbo.inf_dates.months         dbo.[nonvoice weekly_inflowcomcan] as t1  inner join  dbo.inf_dates                  on t1.week = dbo.inf_dates.fin_wk        notes = 'weekly completed'             , ([2mb/sub]) = 'eth'              , dbo.inf_dates.date > convert(datetime, '2017-04-03 00:00:00', 102)  group by   t1.region             ,dbo.inf_dates.months

as can see trying group rows months instead of weeks have in table creating month column , grouping weeks together. when case statement case when t1.week < '5' 'apr' right results forces me group weeks not want. 2 months column in table different way.

this right format, comparing varchar < symbol quite odd,
maybe have cast weeks integers first.
way, if week on or equal 53 ??

also, better use corresponding table rather hardcode cases.

select      t1.region,              count(t1.orders) orders,              case                    when t1.week < 5 'apr'                   when t1.week < 10 'may'                   when t1.week < 14 'jun'                    when t1.week < 19 'jul'                    when t1.week < 23 'aug'                    when t1.week < 27 'sep'                    when t1.week < 32 'oct'                    when t1.week < 36 'nov'                    when t1.week < 40 'dec'                    when t1.week < 45 'jan'                    when t1.week < 49 'feb'                    when t1.week < 53 'mar'                    else 'default value'             end month,              dbo.inf_dates.months         dbo.[nonvoice weekly_inflowcomcan] t1              inner join dbo.inf_dates                  on t1.week = dbo.inf_dates.fin_wk        notes = 'weekly completed'             , [2mb/sub]) = 'eth'              , dbo.inf_dates.date > convert(datetime, '2017-04-03 00:00:00', 102)  group   t1.region             ,dbo.inf_dates.months

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