sql - How to count every half hour? -

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i have query counting every hour, using pivot table. how possible count every 30 minutes?

for example 8:00-8:29,8:30-8:59,9:00-9:29 etc. until 5:00

 select convert(varchar(8),start_date,1) 'day',         sum(case when datepart(hour,start_date) = 8 1 else 0 end) 8 ,         sum(case when datepart(hour,start_date) = 9 1 else 0 end) nine,        sum(case when datepart(hour,start_date) = 10 1 else 0 end) ten,        sum(case when datepart(hour,start_date) = 11 1 else 0 end) eleven,        sum(case when datepart(hour,start_date) = 12 1 else 0 end) twelve,        sum(case when datepart(hour,start_date) = 13 1 else 0 end) one_clock,        sum(case when datepart(hour,start_date) = 14 1 else 0 end) two_clock,        sum(case when datepart(hour,start_date) = 15 1 else 0 end) three_clock,        sum(case when datepart(hour,start_date) = 16 1 else 0 end) four_clock   test user_id not null  group convert(varchar(8),start_date,1) order convert(varchar(8),start_date,1)

i use sql server 2012 (version microsoft sql server management studio 11.0.3128.0)

try using iif below:

select convert(varchar(8),start_date,1) 'day', sum(iif(datepart(hour,start_date) = 8 ,  datepart(minute,start_date) >= 0 ,  datepart(minute,start_date) =< 29,1,0)) eight_tirty      test user_id not null group  convert(varchar(8),start_date,1) order  convert(varchar(8),start_date,1)

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