7/31/2023 0 Comments Redshift datediffAn OOM error resulting from an older driver version: If you're working on an older driver version and your cluster is experiencing frequent reboots, download the latest JDBC driver version.To resolve this, consider rolling back your patch or failed patch. An out-of-memory (OOM) error on the leader node: A query that runs on a cluster that's upgraded to a newer version can cause an OOM exception, initiating a cluster reboot.Here are some common issues that can trigger a cluster reboot: Resolution An issue with your Amazon Redshift cluster was detected To be notified about any cluster reboots outside of your maintenance window, create an event notification for your Amazon Redshift cluster. A faulty node in the cluster was replaced.An issue with your Amazon Redshift cluster was detected.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.An Amazon Redshift cluster is restarted outside of the maintenance window for the following reasons: 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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