[sql] How do I get the current year using SQL on Oracle?

I need to add the current year as a variable in an SQL statement, how can I retrieve the current year using SQL?

i.e.

  BETWEEN 
    TO_DATE('01/01/**currentYear** 00:00:00', 'DD/MM/YYYY HH24:MI:SS')
    AND
    TO_DATE('31/12/**currentYear** 23:59:59', 'DD/MM/YYYY HH24:MI:SS')

To display the current system date in oracle-sql

   select sysdate from dual;

Use extract(datetime) function it's so easy, simple.

It returns year, month, day, minute, second

Example:

select extract(year from sysdate) from dual;

Since we are doing this one to death - you don't have to specify a year:

select * from demo
where  somedate between to_date('01/01 00:00:00', 'DD/MM HH24:MI:SS')
                and     to_date('31/12 23:59:59', 'DD/MM HH24:MI:SS');

However the accepted answer by FerranB makes more sense if you want to specify all date values that fall within the current year.

Yet another option would be:

SELECT * FROM mytable
 WHERE TRUNC(mydate, 'YEAR') = TRUNC(SYSDATE, 'YEAR');

Another option is:

SELECT *
  FROM TABLE
 WHERE EXTRACT( YEAR FROM date_field) = EXTRACT(YEAR FROM sysdate)