sql server - Efficient way to compare a datetime to midnight in SQL -

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i want select sql server table datetime field > midnight of current date.

i'm using following ask if there more efficient way it?

 start_time > (select dateadd(d,0,datediff(d,0,getdate())))

if convert or cast current date date instead of datetime, believe can use in because date data type set midnight:

where start_time > convert(date, getdate())

or

where start_time > cast(getdate() date)

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