What happens when you do a comparison "date <= datetime" in SQL-server?
Are they both cast to date or are they both cast to datetime in order to do the comparison?
1 Answers
datetime has higher precedence than date so the date will be cast to datetime.
This is documented here.
Or you can also see this below
DECLARE @D DATETIME = '2022-09-15 11:59:59';
SELECT CASE WHEN @D = CAST(@D AS DATE) THEN 'Equal' ELSE 'NotEqual' END
(Returns "NotEqual". If the implicit casting was to date and the time portion removed both would be equal)
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