Remember That Dates Are Numbers : DATE « PL SQL Data Types « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » PL SQL Data Types » DATE

21. 6. 18. Remember That Dates Are Numbers

Finding the Difference between Dates.


SQL>

SQL> create or replace function f_secBetween_nr (i_date1_dt DATE,i_date2_dt DATE)

  2  return NUMBER is

  3      v_ret_nr NUMBER;

  4  begin

  5      v_ret_nr:=i_date1_dt-i_date2_dt;

  6      return v_ret_nr*(24*60*60);

  7  end f_secBetween_nr;

  8  /



Function created.



SQL> select f_secBetween_nr(sysdate, sysdate +1) from dual

  2  /



F_SECBETWEEN_NR(SYSDATE,SYSDATE+1)

----------------------------------

                            -86400

21. 6. DATE
	21. 6. 1.	DATE
	21. 6. 2.	Define DATE type variable
	21. 6. 3.	Date literals
	21. 6. 4.	Displaying Date and Time
	21. 6. 5.	Using the DATE Format Mask
	21. 6. 6.	Using Format Masks mixed with user string
	21. 6. 7.	Assignment value to DATE type variable during declaration
	21. 6. 8.	Use SYSDATE to initialize an DATE type variable
	21. 6. 9.	Define DATE type variable, assign value TRUNC(SYSDATE)
	21. 6. 10.	Use FOR LOOP to loop through dates
	21. 6. 11.	Compare DATE type variable in IF statement
	21. 6. 12.	Compare DATE type variable after truncating
	21. 6. 13.	Combine TO_NUMBER and TO_DATE to get different parts of a Date
	21. 6. 14.	Performing Calculations on a Converted Date
	21. 6. 15.	Converting DATE to a Spelled-Out Character Format
	21. 6. 16.	Calculate the months between two dates
	21. 6. 17.	Use the date value back and forth
	21. 6. 18.	Remember That Dates Are Numbers
	21. 6. 19.	Check the last date that a date type variable can hold
	21. 6. 20.	Use the new EXTRACT function to grab individual year and month components.
	21. 6. 21.	ROUND function being applied to datetime values
	21. 6. 22.	TO_CHAR(C,'YYYY-MM-DD HH:MI:SS.FF AM TZH:TZM TZR TZD')

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