SQL Converting Time to Half Hour Increments and Extracting only HH:MM -


i need show report counts sessions in half hour increments 24 hour period. used following case statement , works convert minutes in date field. 

case when datepart (mi,"tablename.name") < 30  dateadd(hh, datediff(hh, 0, "tablename.name")+0, 0) else dateadd (mi, 30,  dateadd(hh, datediff(hh, 0, "tablename.name")+0, 0)) end,

now having trouble pulling out hh:mm. tried this, gives me 2 additional columns. 

datepart(hh,"tablename.name") 'start_hour', datepart(minute,"tablename.name") 'start_min'

try this:

cast(datepart(hour,"tablename.name") char(2)) + ':' +  cast(datepart(minute,"tablename.name") char(2)) start_time

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