If the second date or time is earlier than the first date or time, the result is negative. ![]() If the second date or time is later than the first date or time, the result is positive. The expressions must both contain the specified date or time part. Like most other relational databases such as MySQL, SQL Server, Oracle, DB2, etc., Redshift can handle and manipulate time series data. If you are finding the difference in hours between two timestamps, 8:30:00 and 10:00:00, the result is 2 hours.Äate|time|timetz|timestamp: A DATE, TIME, TIMETZ, or TIMESTAMP column or expressions that implicitly convert to a DATE, TIME, TIMETZ, or TIMESTAMP. Redshift is a database provided as a part of AWS (Amazon Web Services), based on the Postgres database, but with some differences. If you are finding the difference in hours between two timestamps, 01-01-2009 8:30:00 and 01-01-2009 10:00:00, the result is 2 hours. Pay particular attention to the words datepart boundaries crossed. In this case, the function returns 1 year despite the fact that these dates are only one day apart. The Actual Definition of DATEDIFF () The reason we get the results we do is because the DATEDIFF () function is defined as follows: This function returns the count (as a signed integer value) of the specified datepart boundaries crossed between the specified startdate and enddate. While migrating the code from Redshift you will need to rewrite this function. For example, suppose that you're calculating the difference in years between two dates, 12-31-2008 and 01-01-2009. DATEDIFF is the equivalent for DATEDIFF with datepart function in Bigquery. Specifically, DATEDIFF determines the number of date part boundaries that are crossed between two expressions.The value can be a string literal or can be unquoted (e.g. Must be one of the values listed in Supported Date and Time Parts (e.g. WEEK (): This date part begins on WEEKDAY.![]() DATEDIFF supports the following datepart values: DAY WEEK This date part begins on Sunday. ![]() If the first date occurs before the second date, then the result is non-positive. For more information, see Date parts for date or timestamp functions. DATEDIFF( , , ) For minus sign - Arguments For DATEDIFF: dateortimepart The unit of time. DATEDIFF Description Returns the number of datepart boundaries between the two dateexpression s.Checking the docs for Amazon Redshift shows this: DATEDIFF ( datepart, )Äatepart: The specific part of the date or time value (year, month, or day, hour, minute, second, millisecond, or microsecond) that the function operates on.
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