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Only 10+ years later - here's a db<>fiddle which demonstrates the difference between subtracting a date from a date (e.g. SYSDATE) and subtracting a date from a timestamp (e.g. SYSTIMESTAMP).
23 lip 2012 · SELECT ACC_MONTH, ACC_YEAR, GREATEST(ACC_FIRST_DAY_OF_PERIOD, TRUNC(ADD_MONTHS(acc_first_day_of_period, therownum - 1), 'MM')) start_of_period, LEAST(LAST_DAY(ADD_MONTHS(acc_first_day_of_period, therownum)), TRUNC(acc_last_day_of_period)) + 1 - 1/24/60/60 end_of_period
To break the diff between 2 dates into days, hours, minutes, sec -- you can use the following: select to_char( created, 'dd-mon-yyyy hh24:mi:ss' ), trunc( sysdate-created ) "Dy",
4 kwi 2021 · Generate months using SQL macro. select * from date_mgr.generate_months ( next_day ( date'2021-01-01' - 1, 'Monday' ), date'2021-12-31' )
1 cze 2021 · The easiest is the connect by level method: You can use this to fetch all the days between two dates by: * Subtracting the first date from the last to get the number of days * Generate this many rows (adding one if you want to include the end date in the output) * Add the current row number (minus one) to the start date
21 paź 2014 · Oracle enables you to extract the day, month, and year from a date using an extract function: ADD_MONTHS(date, n) – Adds the specific number of months (n) to a date. The 'n' can be both negative and positive: LAST_DAY(date) – Returns the last day in the month of the specified date d. The number of days until the end of the month.
LAST_DAY returns the date of the last day of the month that contains date. The last day of the month is defined by the session parameter NLS_CALENDAR. The return type is always DATE, regardless of the data type of date.
