Great, but I need  function calculat different between date time 1 and date tmie 2 using sql queries 

Hi Andrew,

In Advanced SQL, the syntax varies if you're using SQL Server, MySQL or Oracle.

For instance, if you're using SQL Server, the syntax is DATEDIFF( date_part , start_date , end_date) where the date_part defines if you're looking for the difference in days, minutes, etc.

For instance,

SELECT DATEDIFF(hh, {User_Extendend}.[LoginStartDate], {User_Extended}.[LoginEndDate]) FROM {User_Extended} would give you the difference in hours.

Here you can find examples and the possible values for the date_part.

Regards,

João