select LEFT( CAST(datediff(Hour,W.U_totime,W.U_frmtime) AS VARCHAR(100)), LEN(CAST(datediff(Hour,W.U_totime,W.U_frmtime) AS VARCHAR(100)) - 2) +':' +RIGHT( CAST(datediff(Hour,W.U_totime,W.U_frmtime) AS VARCHAR(100)), 2)
DATEPART(Hour,W.U_totime) as "hour"
from [@TI_WIPHDR] W