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Say for instance I’m joining on a number table to perform some operation between two dates in a subquery, like so:
select n
,(select avg(col1)
from table1
where timestamp between dateadd(minute, 15*n, @ArbitraryDate)
and dateadd(minute, 15*(n+1), @ArbitraryDate))
from numbers
where n < 1200
Would the query perform better if I, say, constructed the date from concatenating varchars than using the dateadd function?
Keeping data in the datetime format using DATEADD is most likely to be quicker
Check this question: Most efficient way in SQL Server to get date from date+time?
The accepted answer (not me!) demonstrates DATEADD over string conversions. I’ve seen another too many years ago that showed the same