Used to determine the result and thus determines the precision of the result. month) used to calculate the difference determines which parts of the DATE, TIME, or TIMESTAMP field are For example, DATEDIFF ('week', '06-01-2021', '06-28-2021') returns 4 This function can be used to bucket times together, like when doing a cohort analysis. For more details, including examples, see Data warehouses like Redshift and Snowflake have a super useful DATEDIFF function given two timestamps and a date part (hour, year, week, etc) it'll return how far apart they are. DATETRUNC This function can be thought of as date rounding. In this section, you can find information about the date and time scalar functions that Amazon Redshift supports. DATEPART Returns the name of the specified date part as an integer. Introduction to Amazon Redshift Image Source Amazon Redshift is a fully managed Cloud Data Warehouse service with petabyte-scale storage. DATEPARSE Returns specifically formatted strings as dates. Redshift DATEDIFF Function: Use-case Conclusion Prerequisites A successfully set-up Redshift Data Warehouse. DATENAME Returns the name of the specified date part as a discrete string. Takes three arguments, the start date, the end date, and the unit of duration (one of 'year', 'decade', 'century', 'quarter', 'month', 'week', 'day', 'hour', 'minute', 'second', or 'millisecond'). If date_or_time_part is week (or any of its variations), the output is controlled by the WEEK_START session parameter. DATEDIFF Returns the number of date parts (weeks, years, etc) between two dates. The date function used to returns the difference between two date or datetime values as a given unit of duration. The function supports units of years, quarters, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, and nanoseconds.ĭate_or_time_part must be one of the values listed in Supported Date and Time Parts. The usage of the datediff is similar in all the databases except for the. Output values can be negative, for example, -12 days.ĭate_or_time_expr1 and date_or_time_expr2 can be a date, time, or timestamp. Redshift DateDiff is used to find the difference between the specified dates.
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