![]() ![]() ![]() Working knowledge of querying databases.A successfully set-up Redshift Data Warehouse. ![]() and this makes it a little bit more complex compared to other data types. There are other functions in Redshift relating to DateTime, the reason being that, unlike other data types, with DateTime you have many different parts like Day, Week, Month, Quarter, Year, Hour, Minutes, Seconds, etc. They either take a date as an input or show a date as an output. In this post, we will look at Date functions in Redshift - specifically the Redshift DATEDIFF and DATEADD functions with syntax and practical use cases of using these functions. Date functions to manipulate date data types in Redshift.Numeric functions to perform operations on numeric data.String functions to perform operations on strings.3) Redshift DATEDIFF Function: Use-case.Simplify Redshift ETL and Analysis Using Hevo’s No-code Data Pipeline.DATEDIFF Redshift Function with TIMETZĭATEDIFF can be used to get difference between TIMETZ datatype columns as well.įollowing Query finds the differences between PST & IST time-zone in number of hours. Same as above example you can use minute, second, millisecond, or microsecond as time difference unit. The following example finds the difference between 03:00:00 & 13:05:00 time in number of hour which gives 10 as output as hour difference shown in screen-shot. You can also get hour/minute/second from TIME datatype using DATEDIFF. SELECT DATEDIFF(millisecond, CAST(' 01:00:00' as TIMESTAMP), CAST(' 05:05:00' as TIMESTAMP)) as DATEDIFF The following Query gives the difference between 01:00:00 & 05:05:00 timestamps in number of milliseconds which gives 14,700,000 as output as millisecond difference shown in screen-shot. SELECT DATEDIFF(hour, CAST(' 01:00:00' as TIMESTAMP), CAST(' 05:05:00' as TIMESTAMP)) as DATEDIFF The following example finds the difference between 01:00:00 & 05:05:00 timestamps in number of seconds which gives 14,700 as output as hour difference shown in screen-shot. SELECT DATEDIFF(minute, CAST(' 01:00:00' as TIMESTAMP), CAST(' 05:05:00' as TIMESTAMP)) as DATEDIFF The following Query gives the difference between 01:00:00 & 05:05:00 timestamps in number of minutes which gives 245 as output as minute difference shown in screen-shot. The following example finds the difference between 01:00:00 & 05:05:00 timestamps in number of hours which gives 4 as output as hour difference shown in screen-shot. Now let’s look at some examples how you can find different between 2 timestamps in hour, minute, second, millisecond. SELECT DATEDIFF(day, CAST('' as DATE), CAST('' as DATE)) as DATEDIFF ĭATEDIFF Redshift Function with TIMESTAMP The following Query gives the difference between & dates in number of days which gives 731 as output as day difference shown in screen-shot. SELECT DATEDIFF(month, CAST('' as DATE), CAST('' as DATE)) as DATEDIFF The following example finds the difference between & dates in number of months which gives 24 as output as month difference shown in screen-shot. SELECT DATEDIFF(year, CAST('' as DATE), CAST('' as DATE)) as DATEDIFF The following Query gives the difference between & dates in number of years which gives 2 as output as year difference shown in screen-shot. Now let’s look at some examples how you can find different between 2 dates in year, month or day. If your input date is in string or number, please convert into date or timestamp as per format of it.ĭate2|timestamp2:- “To date or timestamp” for which you want to calculate difference. It supports DAT E, TIME, TIMETZ, or TIMESTAMP. Please use unit of date based on your business requirement.ĭate1|timestamp1:- “ From date or timestamp” for which you want to calculate difference. Like if you apply DATEDIFF on 01-01-2008 & 01-02-2008 with month unit it will return 1. It returns the difference between two date in BIGINT datatype. Unit_of_difference:- The specific unit of the date or time value like year, month, or day, hour, minute, second, millisecond, or microsecond Syntax of DATEDIFF DATEDIFF(unit_of_difference, date1|timestamp1, date2|timestamp2) DATEDIFF is used to get difference between the two date/timestamp in unit of year, month, or day, hour, minute, second, millisecond or microsecond. ![]()
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