SQL Datediff - find datediff between rows

Question

I would like to query a database using sql to show the difference in time between id 1,2,3 and so on. basically it will compare the row below it for all records. any help wo

Answer 1

Standard ANSI SQL solution. Should work in PostgreSQL, Oracle, DB2 and Teradata:

SELECT idcode, 
       date_time, 
       date_time - lag(date_time) over (order by date_time) as difference
FROM your_table