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select DATEPART (hh ,Date_time ) as Hours ,
sum(Counts)*100.0/(Select sum(Counts) as total
                          from APP_MR_UL_L_TA b
                          where BSC_NO = 'BSC0121401' and DATEPART (hh ,a.Date_time ) = DATEPART (hh ,b.Date_time ) ) as PerValues
from APP_MR_UL_L_TA a
where 1 = 1 and BSC_NO = 'BSC0121401' and DL_L < -90 and TA <2
group by DATEPART (hh ,Date_time )
order by DATEPART (hh ,Date_time ) asc

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