sql - Find the difference between two date fields that are within a certain time parameter -

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i have tried few ways here pseudo-code sql:

select count(*) counter  startdate , enddate 30 minutes , archived = 1.

the datatypes mssql fields datetime

the other idea had bring select statement , add dateadd datdiff not sure how account 2 seperate fields (startdate,enddate)...

i hope can straighten me out.

select count(*) yourtable datediff(minute,startdate,enddate) <= 30 , archived = 1

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