![]() ![]() Result: 75 PostgreSQL DATEDIFF - User-Defined Function (UDF)īesides a separate expression to calculate the datetime difference for each time unit, you can use a function similar to SQL Server DATEDIFF function. In PostgreSQL, you can use an expression to define the number of minutes (see above), multiple by 60 and add the difference is seconds. PostgreSQL - Datetime Difference in SecondsĬonsider SQL Server function to calculate the difference between 2 datetime values in seconds: ![]() Note that these PostreSQL expressions return the number of full minutes passed between the datetime values. In PostgreSQL, you can use an expression to define the number of hours (see above), multiple by 60 and add the difference is minutes. Note that DATEDIFF returned 2 minutes although there is just 1 minute and 15 seconds between the datetime values. Result: 1 PostgreSQL - Date Difference in WeeksĬonsider SQL Server function to calculate the difference between 2 datetime values in minutes: So you can use DATE_PART function to extact the number of days, but it returns the number of full days between the dates. In PostgreSQL, if you subtract one datetime value (TIMESTAMP, DATE or TIME data type) from another, you will get an INTERVAL value in the form ” ddd days hh:mi:ss”. Note that DATEDIFF returned 2 days, although there is only 1 day and 2 hours between the datetime values. Here's more about the EXTRACT() function.Consider SQL Server function to calculate the difference between 2 dates in days: If you'd like to calculate the difference between the timestamps in seconds in PostgreSQL, subtract one date from the other (here: arrival - departure) then extract EPOCH from the difference to get it in seconds. Solution 3 (difference in seconds):ĮXTRACT(EPOCH FROM (arrival - departure)) AS difference In this solution, the resulting column is also of the type interval. Heres a one-liner to calculate the elapsed time in milliseconds from a past TIMESTAMP to now(): SELECT ROUND((EXTRACT (EPOCH FROM now()) - EXTRACT (EPOCH FROM. Here, it would be AGE(arrival, departure). If you'd like to get the difference in years, months, days, hours, minutes, and seconds, use the AGE(end, start) function. Solution 2 (difference in years, months, days, hours, minutes, and seconds): The difference will be of the type interval, which means you'll see it in days, hours, minutes, and seconds. To calculate the difference between the timestamps in PostgreSQL, simply subtract the start timestamp from the end timestamp. Solution 1 (difference in days, hours, minutes, and seconds): You'd like to calculate the difference between the arrival and the departure. ![]() In the travel table, there are three columns: id, departure, and arrival. You have two columns of the type timestamp and you want to calculate the difference between them. ![]()
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